Powershell Error Handling while processing a list - powershell

Question

I'm trying to clean up the active directory ahead of the Skype 4 Business deployment, which requires correcting sip addressing. After doing some poking around I found other problems, including unusual emails formats, which I need to account for. I was asked to roll out the changes, but due to an error Get-CsAdUser -Identity $line.Name when the user can't be found. However this means they are taking a slot from a user who could be changed, as written at this time.
I would like it if the error occurs increase $line, do not increment $limiter, and try again with the next person on the list. I'm still reading how to use try/catch and return but I'm still unsure how to structure these to allow script to process another 25 people every run.
## Collect User Base
Get-CsAdUser -OU "OU=..." -Filter {Enabled -eq $True} | Where-Object{$_.UserAccountControl -notmatch "AccountDisabled"}| Select Name, WindowsEmailAddress, SipAddress|Export-Csv -NoTypeInformation -Append -Path c:\tmp\EmailSIP_$d.csv
$csv = Import-csv c:\tmp\EmailSIP_$d.csv
## Change 25 users
$first = $True
$limiter = 0
foreach ($line in $csv){
$goodsip = -join ("sip:", $line.WindowsEmailAddress)
$sipcheck = ($goodsip -ne $line.SipAddress) #If SIP not as expected then "proceed with change is TRUE"
$otherchecks #If no other AD fields are formatted 'incorrectly' will "proceed with change be True"
If ($emailcheck -And $otherchecks){
If ($first) {
Write-Output (-join ("Name, WindowsEmailAddress, old-SipAddress, new-SipAddress"))|Out-File -Append c:\tmp\Changed_EmailSIP_$d.txt
$first = $False}
If ($limiter -lt 25){
Write-Output (-join ($line.Name,", ", $line.WindowsEmailAddress,", ", $line.SipAddress,", ", $goodsip))|Out-File -Append c:\tmp\Changed_EmailSIP_$d.txt
#Errors Generated in following line for some $line.NAMES
Get-CsAdUser -Identity $line.Name|Set-CsUser -SipAddress $goodsip -ErrorAction Ignore -whatif
$limiter++}
If ($limiter -ge 25){break} #exit loop if 25 changes
} #end of IF Email and Sip
} #end of foreach
The error I'm getting is:
Get-CsAdUser : Management object not found for identity "person1".
At line:3 char:1
+ Get-CsAdUser -Identity $line.Name|Set-CsUser -SipAddress $goodsip -wh ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidData: (person1:UserIdParameter) [Get-CsAdUser], ManagementException
+ FullyQualifiedErrorId : Identity,Microsoft.Rtc.Management.AD.Cmdlets.GetAdUserCmdlet

Answer 1

Thank you #TheIcorrigible for your comment.
The working code:
foreach ($line in $csv){
$goodsip = -join ("sip:", $line.WindowsEmailAddress)
$sipcheck = ($goodsip -ne $line.SipAddress)
$otherchecks
If ($emailcheck -And $otherchecks){
If ($limiter -lt 25){
try{
Get-CsAdUser -Identity $line.Name -ErrorAction Stop|Set-CsUser -SipAddress $goodsip -whatif
If ($first) {
Write-Output (-join ("Name, WindowsEmailAddress, old-SipAddress, new-SipAddress"))|Out-File -Append c:\tmp\Changed_EmailSIP_$d.txt
$first = $False}
Write-Output (-join ($line.Name,", ", $line.WindowsEmailAddress,", ", $line.SipAddress,", ", $goodsip))|Out-File -Append c:\tmp\Changed_EmailSIP_$d.txt
$limiter++}
catch{continue}
}
If ($limiter -ge 25){break}
}
}