emptyshader should fail onProgram

Change-Id: I285d3cc3ef66dc10d2bcabea15a38958075d24b8
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/279257
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
2 files changed