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'

# Introduction

This module adds newly registered users as members to a specified MUC
room and sends them an invite. In a way, this is similar in purpose to
[mod_support_contact] and [mod_default_bookmarks].

# Example

    VirtualHost"example.com"
        modules_enabled = { "support_room" }
        support_room = "room@muc.example.com"
        support_room_inviter = "support@example.com"
        support_room_reason = "Invite new users to the support room"

    Component "muc.example.com"

# Compatibility

This module

  Version   Works
  --------- -------
  0.11.x    Yes
  0.10.x    No