mod_report_forward: Fix traceback on error message passed to datetime function If archive:get() returns an error, e.g. because it can't find a message with the given ID, it may return e.g. nil, "item-not-found" or similar where the error condition ends up in reported_message_time, which gets passed to util.datetime, which thus ends up doing math to a string or error object.

---
summary: Injects ecaps2 elements (XEP-0390) in presence
---

Description
===========

This module injects [XEP-0390: Entity Capabilities 2.0] elements in the
presence once the legacy caps (XEP-0115) are received.

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

  ------- ---------------
  trunk   Works
  0.11    Does not work
  0.10    Does not work
  ------- ---------------