Currently, if a user signed up via OAuth2 and then somehow gets their E-Mail account compromised, their Forgejo account can be taken over by requesting a password reset for their Forgejo account.
This PR changes the logic so that a password reset request is denied for a user using OAuth2 if they do not already have a password set.
Which should be the case for all users who only ever log in via their Auth-Provider.
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/9060
Reviewed-by: Gusted <gusted@noreply.codeberg.org>
Co-authored-by: BtbN <btbn@btbn.de>
Co-committed-by: BtbN <btbn@btbn.de>
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