artiq_rpctool does not cope with kwonlyargs

[jordens]

This is artiq_rpctool ... list-methods on the newfocus8742 controller.

Traceback (most recent call last):
  File "/home/rj/src/conda/envs/py35/bin/artiq_rpctool", line 11, in <module>
    load_entry_point('artiq', 'console_scripts', 'artiq_rpctool')()
  File "/home/rj/src/artiq/artiq/frontend/artiq_rpctool.py", line 138, in main
    list_methods(remote)
  File "/home/rj/src/artiq/artiq/frontend/artiq_rpctool.py", line 69, in list_methods
    if kwonlyarg in argspec["kwonlydefaults"]:
TypeError: argument of type 'NoneType' is not iterable

The signature is: f(self, xx=None, *nn)

argspec is: {'varargs': 'nn', 'kwonlydefaults': None, 'varkw': None, 'defaults': None, 'args': ['self'], 'annotations': {}, 'kwonlyargs': ['xx']}

[whitequark]

No, the signature is: do_dh(self, *nn, xx). You have the wrong method, f is fine.

[jordens]

Right! Sorry for the red herring.