remove notificatoin about canceled trip if cancelation has been canceled

src/model/tripdetails.rs

@@ -77,6 +77,12 @@ WHERE day = ? AND planned_starting_time = ?
             return;
         }
 
+        if self.max_people == 0 {
+            // Cox cancelled event, thus it's probably bad weather. Don't bother with sending
+            // notifications
+            return;
+        }
+
         if Trip::find_by_trip_details(db, self.id).await.is_none() {
             // This trip_details belongs to a planned_event, no need to do anything
             return;