Ignoring blank email address input field Google Apps Script - email

Question

I have an HTML form which contains email addresses from various suppliers. I am creating a kind of mail merge function so I can send all the contacts a personalised email when the form is submitted. Here is my .gs file:
function sendEmail(form) {
const sSheet = SpreadsheetApp.getActiveSpreadsheet();
const file = DriveApp.getFileById(sSheet.getId());
const documentUrl = file.getUrl();
/* var toEmail = form.toAddress;
var ccEmail = form.ccAddress;
var fromEmail = "****#*****.com";
var subject = form.subject;
var message = form.message; */
var toEmail = "";
var fromEmail = "****#*****.com";
var message = "";
var hotelAddresses = [
form.toAddress1,
form.toAddress2,
form.toAddress3,
form.toAddress4,
form.toAddress5,
form.toAddress6,
form.toAddress7,
form.toAddress8,
form.toAddress9,
form.toAddress10,
form.toAddress11,
form.toAddress12,
form.toAddress13,
form.toAddress14,
form.toAddress15,
form.toAddress16,
form.toAddress17,
form.toAddress18,
form.toAddress19,
form.toAddress20,
form.toAddress21,
form.toAddress22,
form.toAddress23,
form.toAddress24,
form.toAddress25,
form.toAddress26,
form.toAddress27,
form.toAddress28,
form.toAddress29,
form.toAddress30,
form.toAddress31,
form.toAddress32,
form.toAddress33,
];
var contactNames = [
form.contactName1,
form.contactName2,
form.contactName3,
form.contactName4,
form.contactName5,
form.contactName6,
form.contactName7,
form.contactName8,
form.contactName9,
form.contactName10,
form.contactName11,
form.contactName12,
form.contactName13,
form.contactName14,
form.contactName15,
form.contactName16,
form.contactName17,
form.contactName18,
form.contactName19,
form.contactName20,
form.contactName21,
form.contactName22,
form.contactName23,
form.contactName24,
form.contactName25,
form.contactName26,
form.contactName27,
form.contactName28,
form.contactName29,
form.contactName30,
form.contactName31,
form.contactName32,
form.contactName33,
];
var days = [
form.day1,
form.day2,
form.day3,
form.day4,
form.day5,
form.day6,
form.day7,
form.day8,
form.day9,
form.day10,
form.day11,
form.day12,
form.day13,
form.day14,
form.day15,
form.day16,
form.day17,
form.day18,
form.day19,
form.day20,
form.day21,
form.day22,
form.day23,
form.day24,
form.day25,
form.day26,
form.day27,
form.day28,
form.day29,
form.day30,
form.day31,
form.day32,
form.day33,
];
var dates = [
form.date1,
form.date2,
form.date3,
form.date4,
form.date5,
form.date6,
form.date7,
form.date8,
form.date9,
form.date10,
form.date11,
form.date12,
form.date13,
form.date14,
form.date15,
form.date16,
form.date17,
form.date18,
form.date19,
form.date20,
form.date21,
form.date22,
form.date23,
form.date24,
form.date25,
form.date26,
form.date27,
form.date28,
form.date29,
form.date30,
form.date31,
form.date32,
form.date33,
];
var times = [
form.time1,
form.time2,
form.time3,
form.time4,
form.time5,
form.time6,
form.time7,
form.time8,
form.time9,
form.time10,
form.time11,
form.time12,
form.time13,
form.time14,
form.time15,
form.time16,
form.time17,
form.time18,
form.time19,
form.time20,
form.time21,
form.time22,
form.time23,
form.time24,
form.time25,
form.time26,
form.time27,
form.time28,
form.time29,
form.time30,
form.time31,
form.time32,
form.time33,
];
var additionalInfo = [
form.additional1,
form.additional2,
form.additional3,
form.additional4,
form.additional5,
form.additional6,
form.additional7,
form.additional8,
form.additional9,
form.additional10,
form.additional11,
form.additional12,
form.additional3,
form.additional14,
form.additional15,
form.additional16,
form.additional17,
form.additional18,
form.additional19,
form.additional20,
form.additional21,
form.additional22,
form.additional23,
form.additional24,
form.additional25,
form.additional26,
form.additional27,
form.additional28,
form.additional29,
form.additional30,
form.additional31,
form.additional32,
form.additional33,
];
for(var i = 0; i<times.length; i++){
var subject = "Meeting - " + days[i] + ", " + dates[i] + " at " + times[i];
toEmail = hotelAddresses[i];
message = "Dear " + contactNames[i] + ","
+"<br><br>"+
"Please confirm the meeting on " + days[i] + " " + dates[i] + " at " + times[i] + "." + "<br>" + "<br>" +
additionalInfo[i] +
" If you could kindly let me know if you are able to confirm that would be great." + "<br>" + "<br>" +
"Many thanks and I look forward to hearing from you soon." + "<br>" + "<br>" +
"Yours sincerely," + "<br>" + "<br>" +
form.yourName + "<br>" + "<br>"
+ "<em><b>" + form.yourPosition + "</b></em> <br><br>" +
"<span style='color:#0e216d'><b> Company name. </b>" + "<br>" +
GmailApp.sendEmail(
toEmail, // recipient
subject, // subject
'test', { // body
htmlBody: message // advanced options
}
);
}
}
It works fine except that sometimes the input fields for email will be blank, in which case I need the script to ignore that supplier and continue to run. At the moment it is obviously hitting the empty input and stopping the execution.
I presume I need a conditional statement of sorts... something along the lines of if(hotelAddresses[i] != null) {}
But I cannot work out where to insert this...
Additional: 31 Aug 18
For the HTML I have a series of objects (33 in total) that are all set up like this:
<input type="checkbox" id="check1" class="check" checked>
<input type="text" id="name1" class="contactNameInput" name="toAddress1">
<input type="text" id="contactName1" class="contactNameInput mailName" name="contactName1">
<input type="text" id="time1" class="contactNameInput hidden mailTime" name="time1">
<input type="text" id="day1" class="contactNameInput hidden mailDay" name="day1">
<input type="text" id="date1" class="contactNameInput hidden mailDate" name="date1">
<textarea class="additional contactNameInput" id="additional1" name="additional1" placeholder="Additional requests..."></textarea>
<div class="preview1"></div>

Answer 1

You want to separate the cases with and without hotelAddresses[i] using a script like if(hotelAddresses[i] != null) {}. When my understanding is correct, how about this modification?
Modification points:
Do you want to add after "<span style='color:#0e216d'><b> Company name. </b>" + "<br>" +? In the current script, it's "<span style='color:#0e216d'><b> Company name. </b>" + "<br>" + GmailApp.sendEmail(...). If you want to add more strings, please put them. If you don't want to add, please remove the last +.
I think that the script of if(hotelAddresses[i] != null) {} can be used in the for loop.
The script which reflected above is as follows.
Modified script:
In this modified script, the script of for loop was modified.
for(var i = 0; i<times.length; i++) {
var toEmail = hotelAddresses[i];
if (toEmail) {
var subject = "subject";
var message = "messages";
GmailApp.sendEmail(toEmail, subject, 'test', {htmlBody: message});
} else {
// do something
}
}
Note:
In this modified script, subject and message are replaced by "subject" and "messages", respectively. So please modify them for your situation.
If you want to do something when hotelAddresses[i] is null, please modify // do something.
If you don't want to do something when hotelAddresses[i] is null, please remove else {}.
If I misunderstand your question, please tell me. I would like to modify it.