difftool: fix dir-diff when file does not exist in working tree
Commit 02c56314 (difftool --dir-diff: symlink all files matching the working tree, 2013-03-14) does not handle the case where a file that is being compared does not exist in the working tree. Fix this by checking for existence explicitly before running git-hash-object. Reported-by: NKevin Bracey <kevin@bracey.fi> Signed-off-by: NJohn Keeping <john@keeping.me.uk> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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