sonic-cli 'show interface Ethernet' gets exception for ipv6 disabled subinterface

[jy5275]

The sonic-cli command 'show interface Ethernet' always gets exception for ipv6 disabled subinterface.

sonic# show interface Ethernet 
Traceback (most recent call last):
  File "/usr/sbin/cli/sonic-cli-if.py", line 119, in <module>
    run(func, sys.argv[2:])
  File "/usr/sbin/cli/sonic-cli-if.py", line 113, in run
    return getattr(Handlers, func)(*args)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/sbin/cli/sonic-cli-if.py", line 97, in get_openconfig_interfaces_interfaces
    show_cli_output(template, resp.content)
  File "/usr/sbin/cli/scripts/render_cli.py", line 164, in show_cli_output
    t_str = (j2_env.get_template(template_file).render(json_output=response, **kwargs))
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/dist-packages/jinja2/environment.py", line 1295, in render
    self.environment.handle_exception()
  File "/usr/local/lib/python3.11/dist-packages/jinja2/environment.py", line 942, in handle_exception
    raise rewrite_traceback_stack(source=source)
  File "/usr/sbin/cli/render-templates/show_interface.j2", line 80, in top-level template code
    {% set ip_list = subif["openconfig-if-ip:ipv6"]["addresses"]["address"] %}
^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/dist-packages/jinja2/environment.py", line 471, in getitem
    return obj[argument]
           ~~~^^^^^^^^^^
jinja2.exceptions.UndefinedError: 'collections.OrderedDict object' has no attribute 'addresses'

As indicated from the stack trace, I found the line 80 of CLI/render/templates/show_interface.j2 is: {% set ip_list = subif["openconfig-if-ip:ipv6"]["addresses"]["address"] %} -> it dones't check if addresses field exist in its parent json object.

I also queried the interfaces config from HTTPS endpoints curl https://localhost/restconf/data/openconfig-interfaces:interfaces --insecure:

...
                     "openconfig-if-ip:ipv6":{
                        "config":{
                           "enabled":false
                        },
                        "state":{
                           "enabled":false
                        }
                     },
...

The openconfig-if-ip:ipv6's value doesn't contain an addresses field. I think that's the reason of this exception