cleaner code thanks to clippy

src/model/planned_event.rs

@@ -67,7 +67,7 @@ FROM user_trip WHERE trip_details_id = ?
             name: r.name.or(r.user_note).unwrap(), //Ok, either name or user_note needs to be set
             registered_at: r.registered_at,
             is_guest: r.is_guest,
-            is_real_guest: r.user_id == None,
+            is_real_guest: r.user_id.is_none(),
         })
         .collect()
     }