tests:Add empty descriptor binding positive test
tests:Add empty descriptor binding positive test

This test replicated the broken case from GH1053.
This case was previously broken but was fixed in previous CL.
Create descriptor set with 3 bindings where 2nd one is empty, then
update the final binding.

KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers