old_contents: import discord
  from discord.ext import commands
  
  
  class CustomContext(commands.Context):
      async def error(self, title: str, description: str = None):
          em = discord.Embed(
              title=f":no_entry_sign: {title}",
              color=discord.Color.dark_red(),
              description=description,
          )
  
          await self.send(embed=em)
  
      async def success(self, title: str, description: str = None):
          em = discord.Embed(
              title=f":white_check_mark: {title}",
              color=discord.Color.dark_green(),
              description=description,
          )
  
          await self.send(embed=em)
  
new_contents: import discord
  from discord.ext import commands
  
  
  class CustomContext(commands.Context):
      async def error(self, title: str, description: str = None):
          em = discord.Embed(
              title=f":no_entry_sign: {title}",
              color=discord.Color.dark_red(),
              description=description or '',
          )
  
          await self.send(embed=em)
  
      async def success(self, title: str, description: str = None):
          em = discord.Embed(
              title=f":white_check_mark: {title}",
              color=discord.Color.dark_green(),
              description=description or '',
          )
  
          await self.send(embed=em)
  
subject: Remove 'None' in embed description