svnmerge.py: Similar to r29741, fix brokenness with r29666 when there is no  default locale for sys.stdout.encoding in Python.
svnmerge.py: Similar to r29741, fix brokenness with r29666 when there is no 
default locale for sys.stdout.encoding in Python.

* contrib/client-side/svnmerge/svnmerge.py
  (recode_stdout_to_file): Treat as a no-op when sys.stdout.encoding returns
  None.

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