wmayer db314cfaeb Gui: fix drag and drop of ViewProvider ...

* ViewProvider::canDragAndDropObject should only return true if an extension handles drag and drop
  Currently it returns true if no extension is available
* ViewProvider::dropObject shouldn't throw an exception if no extension handles drag and drop

As an example consider https://forum.freecad.org/viewtopic.php?t=82957
When selecting two objects then ViewProvider::dropObject is called twice. But for the first call both objects are moved to the destination
and for the second call no extension handles drag and drop any more. This incorrectly leads to a thrown exception.

2023-11-27 11:07:29 -06:00

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