Exception for incomplete quotation in `quotes`

[geirawsm]

There should be an exception for when quotes are added or edited with incomplete quotation:

discord.ext.commands.errors.InvalidEndOfQuotedStringError: Expected space after closing quotation but received 'P'

Reference for possible solution:
https://github.com/tripulse/trigonopulse/blob/bdfd346c59acf0dc9a0384eb5e92358067e5a720/cogs/__init__.py

[geirawsm]

9030034