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.

-- Provides total CPU time, useful for DERIVE

module:set_global();

module:provides("statistics", {
	statistics = {
		cpu_total = { -- milliseconds of CPU time used
			get = function()
				return os.clock() * 1000;
			end
		}
	}
});