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Alex Vandiver authored
dec257a4 fixed RT::CustomField->Create() to accept LinkValueTo and IncludeContentForValue, which are stored in attributes. However, it also ensured that those attributes are created even if they're empty. This means every CF in the system, regardless of if it uses them, adds two attributes. Adjust _URLTemplate to remove attributes that are now empty, and more explicitly return undef when the attribute does not exist. Fixes: #22191
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