message: Don't allow creation of a framebuffer with size of zero in either dimension
  Setting scale or window size could cause a framebuffer of zero in either
  x or y.  This causes a bad handle sent to OSPRay and requires an
  application restart.
diff: @@ -103,6 +103,8 @@ void FrameBuffer::updateHandle()
  }
  auto size = child("size").valueAs<vec2i>();
  + // Assure that neither dimension is 0.
  + size = vec2i(std::max(size.x, 1), std::max(size.y, 1));
  auto colorFormatStr = child("colorFormat").valueAs<std::string>();
  auto fb =
  