message: Don't use a viewport that is 0x0 pixels.
diff: @@ -404,6 +404,10 @@ std::optional<ACesium3DTileset::UnrealCameraParameters> ACesium3DTileset::GetPla
  FVector2D size;
  pViewport->GetViewportSize(size);
  + if (size.X < 1.0 || size.Y < 1.0) {
  + return std::nullopt;
  + }
  +
  return UnrealCameraParameters {
  size,
  location,
  @@ -465,6 +469,10 @@ std::optional<ACesium3DTileset::UnrealCameraParameters> ACesium3DTileset::GetEdi
  double fov = pEditorViewportClient->FOVAngle;
  FVector2D size = pViewport->GetSizeXY();
  + if (size.X < 1.0 || size.Y < 1.0) {
  + return std::nullopt;
  + }
  +
  return UnrealCameraParameters{
  size,
  location,
  