Fix ref updated event on change deletion

If newRev attribute in RefUpdateAttribute is zero id, commit cannot
be retrieved and exception is recorded in the log. Detect this case
and avoid trying to read commit content for zero id.

Bug: Issue 6265
Change-Id: I28a4b15a8e9fc2998e6f92b4176e92799a6a944d
1 file changed
tree: 413a4775eb383378c1ceadad275db15119defcef
  1. .settings/
  2. src/
  3. tools/
  4. .gitignore
  5. bazlets.bzl
  6. BUILD
  7. LICENSE
  8. WORKSPACE