Prevent null fields from displaying in Advanced Post Creation

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So here is a typical code in Post creation:

Smile Design: {Smile Design:36}

Is there a way to not display this entire line if the answer is null? Some code to put around it or other ideas?

<if null don’t display>Smile Design: {Smile Design:36}</if null don’t display>

Obviously this isn’t correct, but this idea/

Thanks,

Dan