Hide Presentation Variable if User does not select any prompt values

Summary

Hide Presentation Variable if User does not select any prompt values

Content

I have multiple prompts on a report.  I declared those prompts as presentation variables.  I am calling the presentation variables on my report in the static text section with @{presentation_variable}.  I would like to hide or write the word "ALL" if the user chooses to not select any values thus bringing back all for the report.