Cassidy Burden 17af578d72 Prevent repo info from crashing when default element doesn't exist.
repo info will crash when using a manifest with no default element despite
default being an optional element. Output nothing for "Manifest Branch" if no
default element exists (or if no default revision exists).

Change-Id: I7ebffa2408863837ba980f0ab6e593134400aea9
2015-07-27 16:56:31 -07:00
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