Merge branch 'stable-3.1'

* stable-3.1:
  StartCommand/ListCommand: Use isEmpty() to test for empty collection
  Make constants final

Change-Id: I2cf4561e60078013d7b6d32756fbd4c94084e1d2
tree: 3209be1cb5aa0c7d544238ee498eac0897254677
  1. .gitignore
  2. .mailmap
  3. .settings/
  4. BUILD
  5. LICENSE
  6. src/