Fix Option raising AttributeError for str and min_length or max_length (issue #1526)

[yoggys]

Summary

It fixes issue #1526

Information

• This PR fixes an issue.
• This PR adds something new (e.g. new method or parameters).
• This PR is a breaking change (e.g. methods or parameters removed/renamed).
• This PR is not a code change (e.g. documentation, README, typehinting, examples, ...).

Checklist

• I have searched the open pull requests for duplicates.
• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
• If type: ignore comments were used, a comment is also left explaining why.

[Dorukyum]

This was tested with other input types too, right?

[yoggys]

This was tested with other input types too, right?

Yes, I added a command with various types in order to verify that it was ok earlier - the bug came out on one of my bigger bots when the commands broke during a library update