SuppressBlankLines Property
True if blank lines are suppressed when mail merge fields in a mail merge main document are empty. Read/write Boolean.
expression.SuppressBlankLines
expression Required. An expression that returns a MailMerge object.
Example
This example opens Main.doc and executes the mail merge operation. When merge fields are empty, blank lines are suppressed in the merge document.
Set myDoc = Documents.Open(FileName:="C:\My Documents\Main.doc")
With myDoc.MailMerge
.SuppressBlankLines = True
.Destination = wdSendToPrinter
.Execute
End With