Null Check for Constant

Hello ,

 

I have a situation where a document /file is generated for each specific state and stored in state specific constants. I have written an Expression  rule to return the constant dynamically based on the state selected. The Rule is returning [Content Constant:3*****] something like this.

I am Unable to perform any Null check isObjectExists functionality on the Constant.

The isObjectExists/isnull work when i hard code the constant.But Dynamically it is not working.

Can you please suggest me any ways?

Or did any body get the same requirement?

 

Thanks In Advance

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