don't create any notification if we are working with planned_event

src/model/tripdetails.rs

@@ -77,6 +77,14 @@ WHERE day = ? AND planned_starting_time = ?
             return;
         }
 
+        if Trip::find_by_trip_details(db, trip_details.id)
+            .await
+            .is_none()
+        {
+            // This trip_details belongs to a planned_event, no need to do anything
+            return;
+        };
+
         let other_trips_same_time = Self::find_by_startingdatetime(
             db,
             self.day.clone(),