Log the reason why a ref object wasn't loaded by RevisionReader

It may happen that one ref cannot be read in memory for being used
in an ApplyObject REST-API. Add more logging on the reason behind
the failure to read all the objects pointed to a ref, so that the
Gerrit admin can take the appropriate actions to allow the replication
shortcut and avoid a full git fetch.

Change-Id: I7dbaa7b6ed35c389c7e2477467829d85dfc542e8
1 file changed
tree: a888ff863217f476f6c4534a43c138196b93361f
  1. src/
  2. BUILD
  3. Jenkinsfile
  4. LICENSE