Hide exception in ObjectCountsWidget for models without a xxx_list
view function
#17342
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Fixes #17341
This is a quick workaround specifically to stop ObjectCountsWidget raising an exception for models without a
xxx_list
view function.(A better, more generally useful solution would be to catch exceptions raised by any widget, and allow the widget pane to be displayed with an error message. That would avoid Netbox becoming unusable for any widget problem, and would also allow the widget settings to be edited to correct the problem)