Fix: audit message being empty for attachment-only scam posts (#1300)

[JankiGadhiya]

Fixed #1300

[CLAassistant]

All committers have signed the CLA.

[Zabuzard]

Looks good so far :) Id like to see a screenshot of it in Discord, maybe we want a few minor tweaks on the text then.
Ill check it out locally and do the local testing myself if you have not setup your testing-bot yet 👍

[Zabuzard]

license/cla was signed (probably with wrong account but its fine)

[Zabuzard]

I did some smaller improvements to the code while doing the local testing right away:

• gradle:spotlessApply to get rid of formatting issues
• replaced text building by "...".formatted(...), more readable
• changed the text from and x attachments: (...) to (The message has x attachments: ...)

[Zabuzard]

Local testing:

No text

No attachments

Both