Follow-up to r25514, note in merge test that we don't yet handle missing dirs. 
Follow-up to r25514, note in merge test that we don't yet handle missing dirs. 

* subversion/tests/cmdline/merge_tests.py
  (mergeinfo_and_skipped_paths): Be specific about what this test *doesn't*
  cover.

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