how can i make a arg not requierd discord.py code example

Example: discord.py optional argument

@client.command()
async def hellothere(ctx, *, msg):
    await ctx.send("General Kenobi")
#to add an optional Argument simply add an =None (anything else alowed to) after msg
#the * means that it gives you everthing after the command
async def hellothere(ctx, *, msg=''):