Prevent orphaned contact cards #3282
Draft
+92
−26
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DRAFT until #3169 is merged
Short description
Prevent the deletion of contacts as long as pages/pois/events still referr to it. Note that no list of objects referring to the contact in question is shown in the error message, since we show that list in the contact details anyways.
Proposed changes
Side effects
Resolved issues
Fixes: #3260
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