BUG: DICOM: don't show up the widget in the test

Libs/DICOM/Core/Testing/ctkDICOMModelTest1.cxx

@@ -75,6 +75,6 @@ int ctkDICOMModelTest1( int argc, char * argv [] )
   qDebug() << model.rowCount() << model.columnCount();
   qDebug() << model.index(0,0);
   viewer.show();
-  return app.exec();
+  //return app.exec();
   return EXIT_SUCCESS;
 }