Este error me da cuando le asigno a un producto un atributo del tipo
selección.
Traceback (most recent call last):
File "/trytond/protocols/jsonrpc.py", line 125, in _marshaled_dispatch
response['result'] = dispatch_method(method, params)
File "/trytond/protocols/jsonrpc.py", line 158, in _dispatch
res = dispatch(*args)
File "/trytond/protocols/dispatcher.py", line 158, in dispatch
result = rpc.result(meth(*c_args, **c_kwargs))
File "/trytond/model/dictschema.py", line 74, in get_keys
selection = dict(json.loads(english_key.selection_json))
ValueError: dictionary update sequence element #0 has length 1; 2 is
required
