Tiny Dawn fix: don't submit empty list of command buffers to the queue.

Change-Id: I1a474007e26a5973431c2ddf9bae99c3e3cb1c37
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/241047
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Stephen White <senorblanco@chromium.org>
1 file changed