It is quite valid for the app to pass in NULL for the attribs list.
In this case we currently crash. We could trigger this error using
dEQP.

Change-Id: I64aba1077f9095bd099c6b60f789ec076cb3d385
Reviewed-on: https://chromium-review.googlesource.com/238081Tested-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>