Add a guard to /autosort to check if an argument was given.

[Momshroom]

Closes #

📑 Description

Adds a guard to the autosortcommand code to prevent an index error if no arguments were given.

✅ Checks

• [ x] My pull request adheres to the code style of this project
• My code requires changes to the documentation
• I have updated the documentation as required
• All the tests have passed

ℹ Additional Information

I have no clue how I would run your builds or test on your CI. I did compile the plugin and test it in game and it works on paper build 123 (1.21.1) and fixes the issue I reported in #19