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I added the filter which uses the parameter with operator like (to show all rows that include entered text in the column). I did it like this:
=" * " + Parameters!Roles.Value + " * " .
But if I enter nothing(or leave it NULL) in parameter, it won`t show rows where this column is EMPTY. What to do?
I would change your Filter Expression to resolve to a Boolean result (True or False). Then change your Filter Data Type to Boolean, your Operator to = and your Value to True. Now you can add to your expression to cater to null values – use the IsNothing function.