If a project exists only to provide permissions inherited by other projects, it probably has no Git repository, and thus cannot have any branches. Instead of crashing with an exception when clicking on the branches tab in the admin web UI, display a message. Bug: issue 612 Change-Id: I140ea74e640d732863df2b95eabb6e73787eae11 Signed-off-by: Shawn O. Pearce <sop@google.com>