CL: Fix querying default device if non exists Bug: angleproject:5992 Change-Id: Ie43f905fbb9cf41b0f6f88b2db27ebe9de9c37e8 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2906993 Commit-Queue: John Plate <jplate@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Cody Northrop <cnorthrop@google.com>