* stable-2.16:
CreateTag: Trim revision that is provided in input
CreateTag: Allow revision in input to be empty
RefUtil#parseBaseRevision: Do not log an error if baseRevision is invalid
InvalidRevisionException: Include invalid revision into message
CreateBranch: Trim revision that is provided in input
CreateBranch: Allow revision in input to be empty
CreateBranchIT: Add tests that set revision in the input
Upgrade gitiles blame-cache to 0.2-7.1
The change "Upgrade gitiles blame-cache to 0.2-7.1" is omitted from this
merge since stable-3.0 already uses 0.2-11. A separate change to upgrade
to 0.2-12 will be done later.
Change-Id: I3d4e2a91f61a5ed469d4d52878ba464b9664af6e
4bde8f72bf