Add an extra protection to avoid having an empty group created
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@ -574,7 +574,7 @@ function local_user_set_groups($user, $new_groups = NULL ) {
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/* determine which memberships to add */
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foreach ($new_groups as $groupname) {
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if (in_array($groupname,$cur_groups))
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if ($groupname == '' || in_array($groupname,$cur_groups))
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continue;
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$group = & $config['system']['group'][$groupindex[$groupname]];
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$group['member'][] = $user['uid'];
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