mod_invites_adhoc: Set non-nil defaults for options, fixes traceback (thanks Martin)
Fixes an error when attempting to call the :empty() method on the
default implicit default nil value.
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Introduction
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This module is similar in purpouse to mod\_groups, for when you want all
users on the server to be in each others roster.
Details
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Upon login, this module will add all currently logged in users to the
logging in users roster.
Configuration
=============
Just add it to the modules\_enabled, after that there is no further
configuration.