* client.c (cl_import, cl_commit): Return nil when committed_date and   committed_author are unavailable.
* client.c (cl_import, cl_commit): Return nil when committed_date and
  committed_author are unavailable.

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