Fixes communicator newsfeed app. (#6713)

* Fixes communicator newsfeed app.
Fixes non-terminal while loop in get_latest_news(), helper.dm
Newscaster posts now have a world.time-esque timestamp number, so they can be (almost) uniquely identified

* whoopsie

code/game/objects/items/devices/communicator/communicator.dm

@@ -72,6 +72,7 @@ var/global/list/obj/item/device/communicator/all_communicators = list()
 	var/datum/exonet_protocol/exonet = null
 	var/list/communicating = list()
 	var/update_ticks = 0
+	var/newsfeed_channel = 0
 
 // Proc: New()
 // Parameters: None