As a user I want to see a warning if the set number is missing in the pattern keywords

[nilsschmidt1337]

It would be an entry like:

0 !KEYWORDS Set 6267

The set number is now required. I have to check how multiple sets can be listed.
Is it 0 !KEYWORDS Set 6267, Set 6265 (most likely)
or 0 !KEYWORDS Set 6267, 6265.