Fix the swig-py test failure that resulted from the change made in r947718/r947722 whereby the return value of svn_wc_get_pristine_copy_path() has changed in the case where the file has no pristine text.
Fix the swig-py test failure that resulted from the change made in
r947718/r947722 whereby the return value of svn_wc_get_pristine_copy_path()
has changed in the case where the file has no pristine text.

* subversion/bindings/swig/python/tests/wc.py
  (SubversionWorkingCopyTestCase): In test_get_pristine_copy_path(), test a
    file that exists rather than one that doesn't.

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