[CalDAV/CardDAV] Incorrectly thinks an object is created in offline
In one occasion, after removing an event in SOGo web UI and refreshing Evolution, the event remained present in the Evolution UI. When this happens, no amount of refreshing gets rid of it.
Attempting to delete the event in Evolution fails because of an error server telling that the event does not -- indeed -- exist.
The bdata field of this event happened to be empty somehow. The event was created in SOGo.
The bug is not easily reproducible (it happened only once after several similar operations).
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