bug#21166: 24.4; vc-mode and git error on newly added file to new repository

[Ed Avis]

How about this: check for the error message, and if found then just print 
'empty tree, so no diff to print'.
That would be good enough.  No need for an extra process call either before or 
after.

-- 
Ed Avis <eda@waniasset.com>

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