Enable regression test for issue 1423.
Enable regression test for issue 1423.

* subversion/tests/clients/cmdline/log_tests.py (test_list): Uncomment
  url_missing_in_head.

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