'show feature autorestart' fails when there is a feature with a missing auto_resrtart attribute in CONFIG_DB

[kartik-arista]

Description

The failure is as below.

show feature autorestart
Traceback (most recent call last):
  File "/usr/local/bin/show", line 8, in <module>
    sys.exit(cli())
  File "/usr/local/lib/python3.9/dist-packages/click/core.py", line 764, in __call__
    return self.main(*args, **kwargs)
  File "/usr/local/lib/python3.9/dist-packages/click/core.py", line 717, in main
    rv = self.invoke(ctx)
  File "/usr/local/lib/python3.9/dist-packages/click/core.py", line 1137, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/lib/python3.9/dist-packages/click/core.py", line 1137, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/lib/python3.9/dist-packages/click/core.py", line 956, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/local/lib/python3.9/dist-packages/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/usr/local/lib/python3.9/dist-packages/click/decorators.py", line 64, in new_func
    return ctx.invoke(f, obj, *args, **kwargs)
  File "/usr/local/lib/python3.9/dist-packages/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/usr/local/lib/python3.9/dist-packages/show/feature.py", line 165, in feature_autorestart
    body.append([name, feature_table[name]['auto_restart']])

Steps to reproduce the issue

1. Configure a feature in CONFIG_DB such that auto_restart setting is excluded.
2. Run the 'show feature autorestart' command

Describe the results you received

The show command should complete successfully

Describe the results you expected

The show coimmand failed as above.

Additional information you deem important (e.g. issue happens only occasionally)

Output of show version

admin@cmp235-4:~$ admin@cmp235-4:~$ show version

SONiC Software Version: SONiC.branch.202205-ars.393f0135-buildimage.origin.202205-nightly-2023.01.05.14.58
Distribution: Debian 11.6
Kernel: 5.10.0-18-2-amd64
Build commit: e55c01078
Build date: Thu Jan  5 18:50:05 UTC 2023
Built by: jenkins@jenkins-arsonic-k8s-5-w275n

Platform: x86_64-arista_7800r3ak_36dm2_lc
HwSKU: Arista-7800R3AK-36DM2-C36
ASIC: broadcom
ASIC Count: 2
Serial Number: SSN21060167
Model Number: 7800R3AK-36DM2-LC
Hardware Revision: 29.00
Uptime: 08:07:22 up  1:15,  1 user,  load average: 5.66, 5.41, 5.36
Date: Sat 07 Jan 2023 08:07:22

[kartik-arista]

Please note that this is related to test failures in sonic-mgmt tracked by

sonic-net/sonic-mgmt#6825