Radio Report search : fix category count of related radio reports
Count is done in RadioReportCategoryCountManager annotating queryset via mptt's add_related_count method. These checks database relations. As RadioReport extends SoftDeleteModel, also deleted, but in database still existing tuples are taken into account and a higher count than visible might be shown to user on report list view. Probable solution: remove mptt's method and annotate queryset with count by requesting RadioReport object manager that is aware of SoftDeleteModel