CRUD read fails during decode if top node in yang module is a list

[ghost]

For the oc-pattern test yang model, the CRUD read on A() fails during decoding phase:

  File "ydk/services/crud_service.py", line 151, in read
    return provider.decode(payload, read_filter)
  File "ydk/providers/netconf_provider.py", line 87, in decode
    return self.sp_instance.decode(payload, read_filter)
  File "ydk/providers/_provider_plugin.py", line 132, in decode
    XmlDecoder._bind_to_object(payload, entity, self._get_capabilities())
  File "ydk/providers/_decoder.py", line 183, in _bind_to_object
    curr_rt = get_root(rt, entity._common_path, _yang_ns._namespaces)
  File "ydk/models/oc/oc_pattern.py", line 104, in _common_path
    raise YPYModelError('Key property a is None')
ydk.errors.YPYModelError: Key property a is None

Same issue with codec_service.decode(provider,'''<A xmlns="http://cisco.com/ns/yang/oc-pattern"> <a>Hello</a> </A>''')

[psykokwak4]

Currently the get_top_container_for_namespace in decoder and does not set YANG list key value, this will cause subsequent execution of _commen_path raise YPYModelError, might need to set list key value in get_top_container_for_namespace recursively.

[psykokwak4]

In this generated API for oc-pattern test yang model, we have this leafref A.a assigned as None when initializing, is this expected behavior or a bug? Added sanity test for this but manually assign A.b.b to A.a.

[ghost]

I think that is expected as we initialize integers to none. The recursively setting of keys should work. Thanks for looking into this.