Fixes persistence not spawning instances.

code/modules/persistence/persistence_datum.dm

@@ -30,14 +30,16 @@
 	return TRUE
 
 /decl/persistence_handler/proc/CheckTokenSanity(var/list/tokens)
-	return ( \
-		islist(tokens) && \
-		!isnull(tokens["x"]) && \
-		!isnull(tokens["y"]) && \
-		!isnull(tokens["z"]) && \
-		!isnull(tokens["age"]) && \
-		tokens["age"] <= entries_expire_at \
-	)
+	if(!islist(tokens))
+		return FALSE
+	if(isnull(tokens["x"]) || isnull(tokens["y"]) || isnull(tokens["z"]))
+		return FALSE
+	if(!isnull(entries_expire_at))
+		if(isnull(tokens["age"]))
+			return FALSE
+		if(tokens["age"] > entries_expire_at)
+			return FALSE
+	return TRUE
 
 /decl/persistence_handler/proc/CreateEntryInstance(var/turf/creating, var/list/tokens)
 	return
@@ -63,8 +65,9 @@
 		else
 			return
 
-	if(GetValidTurf(locate(tokens["x"], tokens["y"], tokens["z"]), tokens))
-		return CreateEntryInstance(., tokens)
+	. = GetValidTurf(locate(tokens["x"], tokens["y"], tokens["z"]), tokens)
+	if(.)
+		. = CreateEntryInstance(., tokens)
 
 /decl/persistence_handler/proc/IsValidEntry(var/atom/entry)
 	if(!istype(entry))

code/modules/persistence/persistence_datum_book.dm

@@ -5,7 +5,14 @@
 	ignore_invalid_loc = TRUE
 
 /decl/persistence_handler/book/CreateEntryInstance(var/turf/creating, var/list/tokens)
-	var/obj/item/book/book = new(creating)
+
+	var/book_type = tokens["book_type"]
+	if(book_type)
+		book_type = text2path(book_type)
+	if(!ispath(book_type))
+		book_type = /obj/item/book
+
+	var/obj/item/book/book = new book_type(creating)
 	book.dat =                tokens["message"]
 	book.title =              tokens["title"]
 	book.author =             tokens["writer"]
@@ -29,11 +36,12 @@
 	. = ..()
 
 	var/obj/item/book/book = entry
-	.["author"] =     book.last_modified_ckey || ""
-	.["message"] =    book.dat                || "dat"
-	.["title"] =      book.title              || "Untitled"
-	.["writer"] =     book.author             || "unknown"
+	.["author"]     = book.last_modified_ckey || ""
+	.["message"]    = book.dat                || "dat"
+	.["title"]      = book.title              || "Untitled"
+	.["writer"]     = book.author             || "unknown"
 	.["icon_state"] = book.icon_state         || "book"
+	.["book_type"]  = "[book.type]"
 
 	var/turf/T = get_turf(entry)
 	if(!T || !isStationLevel(T.z))
@@ -62,7 +70,7 @@
 		else
 			T = get_random_spawn_turf(SPAWN_FLAG_PERSISTENCE_CAN_SPAWN)
 
-	. = ..(T, tokens)
+	. = ..()
 
 /decl/persistence_handler/book/GetEntryAge(var/atom/entry)
 	. = -1