Merge "vulkan: fix crash when only non-global layers are enabled" into nyc-dev am: a101f6a446 am: 95e76d6b82
am: dc2ed7ed42

* commit 'dc2ed7ed427cef2e18b273827875165e498948b6':
  vulkan: fix crash when only non-global layers are enabled

Change-Id: I5c3fd83734a9472654b4112149fb52d9bafed5be