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.
---
labels:
- Statistics
summary: Collect statistics on user presences
---
Description
===========
This module measures the number of resources of a certain show (available,
away, etc.) currently connected, and reports using Prosody 0.10 APIs