Hello,
By default, you can assign blank to that particular variable (that stores login name) in text file and inside task you an check if that particular variable is not blank then perform required actions. For e.g. let us say that variable is $Prompt-Assignment$ so in text file you will write, '$Prompt-Assignment$=' (without single quote) and in task insert command as follows.
If $Prompt-Assignment$ Not Equal To "" Then
End If
Hope that helps.
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