fix(Message): handle undefined/null content in cleanContent getter (#3778)
fix(Message): handle undefined/null content in cleanContent getter (#3778)

* Handle undefined/null content in Message#cleanContent

* Typings

* Update typings/index.d.ts

Co-Authored-By: SpaceEEC <8fab3a84635be30879c9e37507df532964d633c1@yahoo.com>

Co-authored-by: SpaceEEC <8fab3a84635be30879c9e37507df532964d633c1@yahoo.com>

SpaceEEC/discord.js,SpaceEEC/discord.js,SpaceEEC/discord.js