fix(report): handle missing command arguments

[tigattack]

Initial Checklist

• Has @tigattack been added as a reviewer?
• If applicable, have the relevant project(s), milestone(s), and label(s) been applied?
• If applicable, have you added details of the cog to the readme as per README.md?

Details

Does this resolve an issue?
Resolves issue where missing report/emergency command arguments are not handled gracefully or usefully.

Changes

Features / Fixes

• Fix handling of command errors
  • Actually catch errors from the emergency command
  • Catch missing argument error for report and emergency commands
• Fix timestamp in cooldown error response to user
• General improvements around types, linting, etc.