offline test: dargs in test_spec can be obmitted

If an element in test_spec does not have 'dargs', an empty dict object
will be used.

BUG=chromium:573933
TEST=make test

Change-Id: I717afafaa32b52202f29ea40b24445cae53b5a3f
Reviewed-on: https://chromium-review.googlesource.com/324911
Commit-Ready: Wei-Han Chen <stimim@chromium.org>
Tested-by: Wei-Han Chen <stimim@chromium.org>
Reviewed-by: Chih-Yu Huang <akahuang@chromium.org>
1 file changed