svnmucc: Change an error message to state another possible cause of the error.
Fixes issue #4854.
* subversion/libsvn_client/mtcc.c
(mtcc_verify_create): Reword error message.
* subversion/tests/cmdline/svnmucc_tests.py
(svnmucc_type_errors, svnmucc_propset_and_put): Update expectations.
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