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mod_roster_command: Fix subscription when the "user JID" is a bare domain. Do not attempt to update the roster when the user is bare domain (e.g. a component), since they don't have rosters and the attempt results in an error: $ prosodyctl mod_roster_command subscribe proxy.example.com contact@example.com xxxxxxxxxxFailed to execute command: Error: /usr/lib/prosody/core/rostermanager.lua:104: attempt to concatenate local 'username' (a nil value) stack traceback: /usr/lib/prosody/core/rostermanager.lua:104: in function 'load_roster' /usr/lib/prosody/core/rostermanager.lua:305: in function 'set_contact_pending_out' mod_roster_command.lua:44: in function 'subscribe'

---
summary: 'Dialback-without-Dialback'
...

Introduction
============

This module implements an optimization of the Dialback protocol, by
skipping the dialback step for servers presenting a valid certificate.

Configuration
=============

Simply add the module to the `modules_enabled` list.

        modules_enabled = {
            ...
            "dwd";
        }

Compatibility
=============

  ------------------ --------------------------
  0.10               Built into mod\_dialback
  0.9 + LuaSec 0.5   Works
  0.8                Doesn't work
  ------------------ --------------------------