AttributeError: 'NoneType' object has no attribute 'qualified_name'

Summary

AttributeError: NoneType object has no attribute qualified_name

Reproduction Steps

Build a help command and attempt to map the commands inside a cog. For example:

import discord

from env import BLUE, PREFIX
from discord.ext import commands

class Help(commands.Cog):
    def __init__(self, client):
        self.client = client

class CustomHelp(commands.HelpCommand):
    async def send_bot_help(self, mapping):
        embed = discord.Embed(title='TITLE_HERE', description='DESCRIPTION_HERE', color=BLUE)
        for cog, cmds in mapping.items():
            name = cog.qualified_name
            embed.add_field(name = name, value = f"{len(cmds)} commands")
            embed.set_thumbnail(url='IMAGE_URL_HERE')

        channel = self.get_destination()
        await channel.send(embed=embed)

client.help_command = CustomHelp()

Minimal Reproducible Code

AttributeError: 'NoneType' object has no attribute 'qualified_name'

Expected Results

Should display a help embed with a list of cogs and their commands.

Actual Results

Errors out with the following error:

AttributeError: 'NoneType' object has no attribute 'qualified_name'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/discord/client.py", line 343, in _run_event
    await coro(*args, **kwargs)
  File "/home/almalinux/Faestine/cogs/events.py", line 43, in on_command_error
    raise error
  File "/usr/local/lib/python3.6/site-packages/discord/ext/commands/bot.py", line 939, in invoke
    await ctx.command.invoke(ctx)
  File "/usr/local/lib/python3.6/site-packages/discord/ext/commands/core.py", line 863, in invoke
    await injected(*ctx.args, **ctx.kwargs)
  File "/usr/local/lib/python3.6/site-packages/discord/ext/commands/core.py", line 94, in wrapped
    raise CommandInvokeError(exc) from exc
discord.ext.commands.errors.CommandInvokeError: Command raised an exception: AttributeError: 'NoneType' object has no attribute 'qualified_name'

Intents

None

System Information

• Python v3.6.8-final
• discord.py v1.7.3-final
• aiohttp v3.7.4.post0
• system info: Linux 4.18.0-348.2.1.el8_5.x86_64 Update README.rst #1 SMP Mon Nov 15 09:17:08 EST 2021

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

This error seems to have also existed in the old discord.py builds as well and may have been carried over: Rapptz/discord.py#2029

[Dorukyum]

cog was None. Some of your commands arent in a cog.