[REFACTOR] Add handler if image is null

lib/repository/lokasi_repository.dart

@@ -45,8 +45,8 @@ class LokasiRepository implements BaseLokasiRepository {
         lokasi.name = 'INVALID';
         lokasi.alamat = 'LOCATION INVALID';
         lokasi.noTelp = '-';
-        lokasi.image = '';
       }
+      lokasi.image ??= '';
       freqPlaces.add(lokasi);
     }
     freqPlaces = freqPlaces.cast<Lokasi>();