Dimension Existence

Hello Group-
I have a part that is fully modeled. Three reference dimensions should
have been placed on this part.
I need the line of code that will check to make sure these dimension
are there, and that they really do exist. If not, a MsgBox needs to
say something. I can't figure out how to check the dimension. Can
anyone help me out?
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Come on people. I know someone out there knows the answer to this if they will just take the time to help. Google groups has never let me down in the past, please don't do it this time either.
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