Resolve issue #1265.
Resolve issue #1265.

For argument parsing errors, do not show the help message, because useful 
information is thrown away.  Instead, show an explicit error message if one 
is available, otherwise show the help.

* subversion/clients/cmdline/main.c
  (main): If an argument parsing error has a useful (non-NULL or not empty)
   error message, display that instead of just showing the help.

Patch by: Julian Foad <julianfoad@btopenworld.com>
(Tweaked by me.)

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