Resolve "Missing permission for user invitations"

Closes #627 (closed)

aleksis/core/rules.py

@@ -325,6 +325,10 @@ rules.add_perm("core.can_register", can_register_predicate)
 can_change_password_predicate = is_site_preference_set(section="auth", pref="allow_password_change")
 rules.add_perm("core.can_change_password", can_change_password_predicate)
 
+# django-invitations
+invite_enabled_predicate = is_site_preference_set(section="auth", pref="invite_enabled")
+rules.add_perm("core.invite_enabled", invite_enabled_predicate)
+
 # OAuth2 permissions
 create_oauthapplication_predicate = has_person & has_global_perm("core.add_oauthapplication")
 rules.add_perm("core.create_oauthapplication_rule", create_oauthapplication_predicate)