Add XFailing diff test for creating git diffs with added and deleted empty files. The git diff format only displays '---' and '+++' lines if we have text changes. Currently it works for added paths but not deleted ones.
Add XFailing diff test for creating git diffs with added and deleted
empty files. The git diff format only displays '---' and '+++' lines
if we have text changes. Currently it works for added paths but not
deleted ones.

* subversion/tests/cmdline/diff_tests.py
  (make_git_diff_header): Add new parameter 'text_changes' defaulting to 
    True.  Only print '---' and '+++' lines if we have text changes. 
  (diff_git_empty_files): New.
  (test_list): Add diff_git_empty_files().

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion