Jarek Radosz 704778f448
FIX: Don't invite new users via group with SSO on or local logins off (#11950)
Issue originally reported in https://meta.discourse.org/t/bypass-sso-by-adding-unkown-email-to-group/177339

Inviting people via email address to a group when SSO is enabled (or local logins are disabled) led to a situation where user records were being created bypassing single sign-on.

We already prevent that in most places. This adds required checks to `GroupsController`.
2021-02-03 18:13:00 +01:00
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