debugging mod_muc_log_http.lua:

- get_room_list() does not seem to return a table
- which can happen when component or muc is not set
- component is of type "table"
- muc is of type "nil" - so this is the problem


debugging output via::

  module:log("info", type(muc));
  module:log("info", muc);

Problem source: mod_muc_log_http was loaded in globals modules_enabled section.