Avoid hard failure when invalid UTF8 is returned.

We want to run all the tests even if skslc returns a goofy character.

Change-Id: I0ee96ba28fb63204b69b4e01caa069e9ce7cc93e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/534672
Reviewed-by: George Wright <wrightgeorge@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
1 file changed