OSError when running "rhncfg-client diff" with undeployed symlink from RHN Satellite 5.4

Issue

• Running a "rhncfg-client diff" on system subscribed to Satellite Configuration Channel fails with:

# rhncfg-client diff
Traceback (most recent call last):
  File "/usr/bin/rhncfg-client", line 34, in <module>
    sys.exit(Main().main() or 0)
  File "/usr/share/rhn/config_common/rhn_main.py", line 187, in main
    handler.run()
  File "/usr/share/rhn/config_client/handler_base.py", line 66, in run
    self._process_file(src, dst, file, ftype, file_info)
  File "/usr/share/rhn/config_client/rhncfgcli_diff.py", line 37, in _process_file
    destlink = os.readlink(dst)
OSError: [Errno 2] No such file or directory: '/opt/simpana/Base/FwHosts.txt'