Result does not exist

I am trying to do a report field in Crystal where if the file does not exist based on a certain field, it will return a blank value, if it does exist, it return the date.

Here is my code:

If isnull({CHARGE_SENTENCE.SENT_END_DATE}) then "Awaiting Trial" Else if then {CHARGE_SENTENCE.SENT_END_DATE}

I have tried several itterations but not luck.

Thank you