I am using function, user(fv!row.userName,"email"). In this if the username is null I am getting the error:
Expression evalution error at function 'user': [InvalidUserException]
Is there any way to put validation that if username is null then it should not throw error or show like no valid email ID
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You can test to see if the User is null, and if not then call the user() function else return an appropriate value - that is use an if() statement!