message: Check for camera aspect child before setting it. Panoramic doesn't have one.
diff: @@ -479,6 +479,7 @@ void MainWindow::reshape(const vec2i &newWindowSize)
  arcballCamera->updateWindowSize(windowSize);
  auto &camera = frame->child("camera");
  + if (camera.hasChild("aspect"))
  camera["aspect"] = windowSize.x / float(windowSize.y);
  }
  