SFC: Error while using port pair group set/unset commands

Setting a port-pair to a port pair group currently fails:

Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/cliff/app.py", line 400, in run_subcommand
    result = cmd.run(parsed_args)
  File "/usr/local/lib/python2.7/dist-packages/osc_lib/command/command.py", line 41, in run
    return super(Command, self).run(parsed_args)
  File "/usr/local/lib/python2.7/dist-packages/cliff/command.py", line 184, in run
    return_code = self.take_action(parsed_args) or 0
  File "/opt/stack/python-neutronclient/neutronclient/osc/v2/sfc/sfc_port_pair_group.py", line 196, in take_action
    attrs['port_pairs'] = sorted(list(set(existing) | set(added)))
TypeError: unhashable type: 'list'
clean_up SetSfcPortPairGroup: unhashable type: 'list'
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/osc_lib/shell.py", line 134, in run
    ret_val = super(OpenStackShell, self).run(argv)
  File "/usr/local/lib/python2.7/dist-packages/cliff/app.py", line 279, in run
    result = self.run_subcommand(remainder)
  File "/usr/local/lib/python2.7/dist-packages/osc_lib/shell.py", line 169, in run_subcommand
    ret_value = super(OpenStackShell, self).run_subcommand(argv)
  File "/usr/local/lib/python2.7/dist-packages/cliff/app.py", line 400, in run_subcommand
    result = cmd.run(parsed_args)
  File "/usr/local/lib/python2.7/dist-packages/osc_lib/command/command.py", line 41, in run
    return super(Command, self).run(parsed_args)
  File "/usr/local/lib/python2.7/dist-packages/cliff/command.py", line 184, in run
    return_code = self.take_action(parsed_args) or 0
  File "/opt/stack/python-neutronclient/neutronclient/osc/v2/sfc/sfc_port_pair_group.py", line 196, in take_action
    attrs['port_pairs'] = sorted(list(set(existing) | set(added)))
TypeError: unhashable type: 'list'

Same result when trying to unset a port pair from a port pair group.

This error raises because the result of the call to "client.find_resource(resource, parsed_args.port_pair_group, cmd_resource='sfc_port_pair_group')['port_pairs']" is already a list().
No need to add square brackets around the result.