fix

app/dialogflow/services/dialog_service.py

@@ -171,11 +171,13 @@ class DialogService:
         return False
     async def search_pickup_points(origin: str = None, dest: str = None):
         session_id = str(int(datetime.now().timestamp()))
-        params = {
-            "origin": origin,
-            "dest": dest,
-            "session_id": session_id,
-        }
+        params =    {k: v for k, v in {
+                    "origin": origin,
+                    "dest": dest,
+                    "session_id": session_id,
+                    }.items() if v is not None
+                }
+        
         response = await api.get('search/metadata/pickup-points', params=params)
         if response.get("status") == 200:
             data = response.get("data")