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We have a private group. If a user joins this group and the administrator approves this request, the user gets an email with an empty subject.
There is a bugs in following files:
components\com_community\controllers\groups.php (line 800)
components\com_community\controllers\notification.php (line 773)
In the JText::sprint call, the param is missing. It has to be:
JText::sprintf('COM_COMMUNITY_GROUP_MEMBER_APPROVED_EMAIL_SUBJECT', $group->name)