Merge "vulkan: fix crash when only non-global layers are enabled" into nyc-dev am: a101f6a446
am: ad442de7cf

* commit 'ad442de7cf7af7f1cc933db26f6a1b83677fddad':
  vulkan: fix crash when only non-global layers are enabled

Change-Id: Id0ad83f1674342e6bcc2fa1445e774bb2c8bb060