Context component:

- corrected slice_unset query filters

src/context/service/database/Slice.py

@@ -202,21 +202,24 @@ def slice_unset(db_engine : Engine, request : Slice) -> Tuple[Dict, bool]:
 
     def callback(session : Session) -> bool:
         num_deletes = 0
-        num_deletes += session.query(SliceServiceModel)\
-            .filter(and_(
-                SliceServiceModel.slice_uuid == slice_uuid,
-                SliceServiceModel.service_uuid.in_(slice_service_uuids)
-            )).delete()
-        num_deletes += session.query(SliceSubSliceModel)\
-            .filter_by(and_(
-                SliceSubSliceModel.slice_uuid == slice_uuid,
-                SliceSubSliceModel.subslice_uuid.in_(slice_subslice_uuids)
-            )).delete()
-        num_deletes += session.query(SliceEndPointModel)\
-            .filter_by(and_(
-                SliceEndPointModel.slice_uuid == slice_uuid,
-                SliceEndPointModel.endpoint_uuid.in_(slice_endpoint_uuids)
-            )).delete()
+        if len(slice_service_uuids) > 0:
+            num_deletes += session.query(SliceServiceModel)\
+                .filter(and_(
+                    SliceServiceModel.slice_uuid == slice_uuid,
+                    SliceServiceModel.service_uuid.in_(slice_service_uuids)
+                )).delete()
+        if len(slice_subslice_uuids) > 0:
+            num_deletes += session.query(SliceSubSliceModel)\
+                .filter_by(and_(
+                    SliceSubSliceModel.slice_uuid == slice_uuid,
+                    SliceSubSliceModel.subslice_uuid.in_(slice_subslice_uuids)
+                )).delete()
+        if len(slice_endpoint_uuids) > 0:
+            num_deletes += session.query(SliceEndPointModel)\
+                .filter_by(and_(
+                    SliceEndPointModel.slice_uuid == slice_uuid,
+                    SliceEndPointModel.endpoint_uuid.in_(slice_endpoint_uuids)
+                )).delete()
         return num_deletes > 0
 
     updated = run_transaction(sessionmaker(bind=db_engine), callback)