Errors with unloading extensions (discord.Bot)

[plun1331]

Summary

Extensions are not unloaded properly

Reproduction Steps

• Load and unload an extension

Minimal Reproducible Code

import discord

client = discord.Bot()

client.load_extension('extension')
client.unload_extension('extension')

Expected Results

Extension unloads

Actual Results

Traceback (most recent call last):
  File "main.py", line 8, in <module>
    client.unload_extension('extension')
  File "/opt/virtualenvs/python3/lib/python3.8/site-packages/discord/cog.py", line 764, in unload_extension
    self._remove_module_references(lib.__name__)
  File "/opt/virtualenvs/python3/lib/python3.8/site-packages/discord/cog.py", line 613, in _remove_module_references
    for cmd in self.all_commands.copy().values():
AttributeError: 'Bot' object has no attribute 'all_commands'

Intents

Default

System Information

• Python v3.8.12-final
• py-cord v2.0.0-alpha
  • py-cord pkg_resources: v2.0.0a4822+g9feb8c16
• aiohttp v3.7.4.post0
• system info: Linux 5.11.0-1026-gcp Create InteractionContext #29~20.04.1-Ubuntu SMP Fri Jan 7 12:24:31 UTC 2022

Checklist

• I have searched the open issues for duplicates.
• I have shown the entire traceback, if possible.
• I have removed my token from display, if visible.

Additional Context

There are also issues when removing a cog before the bot has registered commands:

Traceback (most recent call last):
  File "main.py", line 8, in <module>
    client.unload_extension('extension')
  File "/opt/virtualenvs/python3/lib/python3.8/site-packages/discord/cog.py", line 764, in unload_extension
    self._remove_module_references(lib.__name__)
  File "/opt/virtualenvs/python3/lib/python3.8/site-packages/discord/cog.py", line 610, in _remove_module_references
    self.remove_cog(cogname)
  File "/opt/virtualenvs/python3/lib/python3.8/site-packages/discord/cog.py", line 594, in remove_cog
    cog._eject(self)
  File "/opt/virtualenvs/python3/lib/python3.8/site-packages/discord/cog.py", line 478, in _eject
    bot.remove_application_command(command)
  File "/opt/virtualenvs/python3/lib/python3.8/site-packages/discord/bot.py", line 155, in remove_application_command
    return self._application_commands.pop(command.id)
KeyError: None

Working on a PR to fix this, just made an issue in case someone beats me to it.

[plun1331]

Needs to be reopened as the PR was reverted