Excel VBA Listbox - Only Format non blanks as Dates - date

Question

This one has me stumped. I am populating a Listbox with a range and then formatting column 4 as d/mm/yyyy. This works fine if all cells in column 4 have a date. As some cells that are populated into the Listbox are in fact blank the sub crashes when it hits these cells. I have tried various if and else statements to skip the activecell if blank with no luck.
Grateful for any assistance.
Alex V
Sub populate_listbox_1()
Dim I As Long
Dim I2 As Long
Dim list_count As Long
Dim MyData As Range
Dim r As Long
With edit_report_input.compliments_listbox
.ColumnCount = 17
.ColumnWidths = "70;300;75;90;80;80;100;0;0;0;0;0;0;0;0;20;0"
.RowSource = ""
Set MyData = ActiveSheet.Range("A4:Q498") 'Adjust the range accordingly
.List = MyData.Cells.Value
For r = .ListCount - 1 To 0 Step -1
If .List(r, 1) = "" Then
.RemoveItem r
End If
Next r
End With
For I = 0 To edit_report_input.compliments_listbox.ListCount - 1
edit_report_input.compliments_listbox.List(I, 4) = Format(DateValue(edit_report_input.compliments_listbox.List(I, 4)), "d/mm/yyyy")
Next I
date_rec_compliment = Format(date_rec_compliment, "d/mm/yyyy")
End Sub

Answer 1

you can always check before changing the format. See if below snippet helps
For I = 0 To edit_report_input.compliments_listbox.ListCount - 1
if edit_report_input.compliments_listbox.List(I, 4) <> "" Then
edit_report_input.compliments_listbox.List(I, 4) = Format(DateValue(edit_report_input.compliments_listbox.List(I, 4)), "d/mm/yyyy")
End If
Next I