ignore weblate, 2nd round

[erral]

Additional checks for weblate.

In some cases, there are commits from weblate done by a so called Languages add-on user.

The point is that there is no github user for such user, so commits from that user come like this to mr.roboto:

[
{
   ...
   "author": null,
   "commiter": {"login": "weblate", ...},
   ...
},
...
]

When going through that structure, our previous code added those users to the unknown list, and thus report them as unknown and require them to sign the PCA.

Now, we have generalized this check for given repos and given users, and if the real commiter information is in the list, we just ignore the checks for it.

[erral]

This is wrong, I will update the PR.