mod_firewall: spam-blocking.pfw: Remove requirement for invites to have no body Some clients (e.g. Gajim) send a body, which I guess makes sense. The bare JID sender check should already make it hard to bypass this (i.e. a normal client putting muc#user into a normal chat message shouldn't bypass the usual message filters).

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−This module discards typing notifications sent to a bare host JID,
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−preventing error replies to be sent. These errors are harmless but can
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−be annoying sometimes if your client shows them prominently.