Fixed linting error.

Author: kathryntanardy

src/elections/urls.py

@@ -289,12 +289,12 @@ async def delete_election(db_session: database.DBSession, election_name: str):
     try:
         await elections.crud.delete_election(db_session, slugified_name)
         await db_session.commit()
-    except IntegrityError:
+    except IntegrityError as err:
         await db_session.rollback()
         raise HTTPException(
             status_code=status.HTTP_409_CONFLICT,
             detail=f"{election_name} is still referenced by nominee applications.",
-        )
+        ) from err
 
     old_election = await elections.crud.get_election(db_session, slugified_name)
     return JSONResponse({"success": old_election is None})