mod_sasl2_fast: Improve handling when SASL profile unexpectedly lacks CB
This fixes a traceback reported by riau, but likely does not solve the
underlying cause, whatever that is.
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summary: 'Anonymous unique occupant identifiers for MUCs'
...
Introduction
============
This module implements [XEP-0421: Anonymous unique occupant identifiers for
MUCs](https://xmpp.org/extensions/xep-0421.html).
TODO
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- Subject messages
Compatibility
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0.12 Built-in, not needed
0.11 Works; except in MUC-PMs
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