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: Advertise an external TURN service
...
This module advertises STUN/TURN service to clients via XEP-0215 (it utilizes
mod_external_services to do so, which will be automatically loaded by this
module and must be available).
This module is included with Prosody 0.12 but made available here for older
versions.
Documentation is available on the [Prosody site][doc:modules:mod_turn_external].