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Summary
Refactor the help command, introduce correct error-handling using commands.HelpCommand.
Checklist
[ ] I have updated the documentation to reflect the changes.This PR fixes an issue.This PR adds something new (e.g. new method or parameters or reference to an issue).This PR is a breaking change (e.g. methods or parameters removed/renamed)This PR is not a code change (e.g. documentation, README, ...)