[korganizer] [Bug 431297] New: Removing all categories from an event causes "Akonadi::Exception: No objects specified"

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https://bugs.kde.org/show_bug.cgi?id=431297

            Bug ID: 431297
           Summary: Removing all categories from an event causes
                    "Akonadi::Exception: No objects specified"
           Product: korganizer
           Version: 5.16.0
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: incidence editors
          Assignee: kdepim-bugs at kde.org
          Reporter: wjb at williamjbowman.com
  Target Milestone: ---

SUMMARY

Removing all the categories/tags from an event in the event editor causes an
error. The modified event cannot be saved. Removing only some, but not all,
categories does not cause this error.

STEPS TO REPRODUCE
1. Add an event to a CalDAV calendar some with categories/tags.
2. Save the event.
3. Edit the event and remove all categories/tags.
4. Press "ok" or "Apply" to save the event.
5. An error is raised "Error while trying to modify calendar item. Error was:
Akonadi::Exception: No objects specified"
6. Press "OK"
7. A warning is displayed:
  > Unable to store the incidence in the calendar. Try again?
  >
  > Reason: Akonadi::Exception: No objects specified
  Selecting "Yes" returns to step 5; selecting "No" returns to the edit event
dialog
8. Select "Cancel"; the event cannot be edited.


OBSERVED RESULT
All categories/tags cannot be removed from an event; the event must instead be
deleted and recreated without categories/tags.

EXPECTED RESULT
All categories/tags should be able to be removed from an event.


SOFTWARE/OS VERSIONS

Linux/KDE Plasma: Linux 5.10.2-2-MANJARO 64bit

KDE Plasma Version: 5.10.4 
KDE Frameworks Version: 5.77.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION

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