Persistent papers should not replace the chat window (#16030)

* windows rely on the paper name. NULL is a really bad case

* changed to No Title

code/modules/persistence/effects/paper.dm

@@ -17,6 +17,8 @@
 	var/obj/item/weapon/paper/paper = new paper_type(creating)
 	paper.info = token["message"]
 	paper.name = token["title"]
+	if(!paper.name)
+		paper.name = "No Title"
 	paper.last_modified_ckey = token["author"]
 	paper.age = token["age"]+1
 	if(requires_noticeboard)