Merge pull request #211 from taigaio/cha/20251125/fix-epic-id-null

fix: Allow epic_id to be null in filter

Author: CarlosLVar

taiga/projects/userstories/utils.py

@@ -137,7 +137,9 @@ def attach_epic_order(queryset, epic_id, as_field="epic_order"):
               WHERE "epics_relateduserstory"."user_story_id" = {tbl}.id and
                     "epics_relateduserstory"."epic_id" = {epic_id}"""
 
-    sql = sql.format(tbl=model._meta.db_table, epic_id=int(epic_id))
+    clean_epic_id = "null" if epic_id == "null" else int(epic_id)
+
+    sql = sql.format(tbl=model._meta.db_table, epic_id=clean_epic_id)
     queryset = queryset.extra(select={as_field: sql})
     return queryset