Merge branch 'stable-2.14'

* stable-2.14:
  RefUpdate: Protect against null ObjectId in ReceiveCommand

Change-Id: I8de8b32fda1ed25b2c1014e4b40dca1bae841dae
tree: 6e4512b684efad516c28d47859d25b5691d0062c
  1. .gitignore
  2. BUILD
  3. LICENSE
  4. src/