[FIX] strip group name before calling has_group

user_has_groups is used to check for groups in e.g. view attributes (`@groups`).
When trying to format lists of groups in views, it would break down as it would 
pass e.g. `\n        some.group` to `res.users.has_group`, which would look for 
an xid with the module `\n        some` and (oddly enough) not find it.

Theoretically could also handle that inside res.users.has_group but it seems
ever-so-slightly more risky, and has_group is only used programmatically and 
should thus already be called correctly.

fixes #9797

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