Draft: Resolve "Implement CAMARA-based NBI connector"

Closes #163

src/context/service/database/QoSProfile.py

@@ -103,14 +103,11 @@ def delete_qos_profile(db_engine : Engine, request : str) -> Empty:
     deleted = run_transaction(sessionmaker(bind=db_engine), callback)
     return Empty()
 
-def get_qos_profile(db_engine : Engine, request : str) -> QoSProfile:
+def get_qos_profile(db_engine : Engine, request : str) -> Optional[QoSProfile]:
     def callback(session : Session) -> Optional[QoSProfile]:
         obj : Optional[QoSProfileModel] = session.query(QoSProfileModel).filter_by(qos_profile_id=request).one_or_none()
         return None if obj is None else qos_table_data_to_grpc_message(obj)
-    qos_profile = run_transaction(sessionmaker(bind=db_engine), callback)
-    if qos_profile is None:
-        raise NotFoundException('QoSProfile', request)
-    return qos_profile
+    return run_transaction(sessionmaker(bind=db_engine), callback)
 
 def get_qos_profiles(db_engine : Engine, request : Empty) -> List[QoSProfile]:
     def callback(session : Session) -> List[QoSProfile]: