Fix dm when --config not specified.

Broken by https://skia-review.googlesource.com/c/32862.

Change-Id: I711057da08793902b50e98b67af9107ac9ead8d2
Reviewed-on: https://skia-review.googlesource.com/33663
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Ben Wagner <benjaminwagner@google.com>
1 file changed