ReviewersResolver: Don't log stack trace when group does not exist

If the reviewer with name "foo" is in the config, but that user has
been deactivated, we then attempt to resolve "foo" as a group. When
the group also does not exist, a log is emitted.

Including the entire stack trace causes too much log spam.

Change-Id: I1c23373d64204a2accba141c775d218fe35aaa99
1 file changed
tree: 6e2dafb8e8782c34aa41dcfd7e9d01a859ea4ca5
  1. src/
  2. tools/
  3. .gitignore
  4. bazlets.bzl
  5. BUILD
  6. LICENSE
  7. WORKSPACE