mod_client_management: Prevent exception on missing client info
> attempt to index a nil value (local 'legacy_info')
Unsure how exactly this happens, perhaps by mixing SASL2/BIND2 with
legacy equivalents?
This module writes out a traceback to `traceback.txt` in Prosodys data
directory (see `prosodyctl about`) when the signal `SIGUSR1` is
received. This is useful when debugging seemingly frozen instances in
case it is stuck in Lua code.