Add missing 'get_number_of_citations' method #859
Merged
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I got a cryptic issue (can reproduce it via etree gramplet or calling self.db.get_number_of_citations() without db loaded).
The method for citation objects seems missing and it returns a "NotImplementedError"
on some specific cases. I suppose it can raise an error too if number of citations is 0
after changes on db status but I cannot provide a proper testcase for this hypothesis.
So, just use the same method as the others primary objects on dummydb module.
See #857 and more details on addons.
Also missing on gramps50 and gramps51 branches.