Stacks check for invalid amounts (#91656)

## About The Pull Request
Alleviates #91603

As in it does not fix it because i have not been able to reproduce it.
It now checks for invalid values and defaults to `amount`(which is 1)
during `Initialize()` and not null so we don't have to pass the number
`1` when creating a single sheet.
 
A stack trace is thrown for <= 0 sheet amounts so we can debug & fix
stuff

## Changelog
🆑
code: stacks error on invalid amounts, removed manual passing of number
`1` when creating a single stack in many cases
/🆑

code/game/objects/items/stacks/sheets/mineral.dm

@@ -82,7 +82,7 @@ GLOBAL_LIST_INIT(sandbag_recipes, list ( \
 	if(istype(W, /obj/item/stack/ore/glass))
 		var/obj/item/stack/ore/glass/G = W
 		to_chat(user, span_notice("You fill the sandbag."))
-		var/obj/item/stack/sheet/mineral/sandbags/I = new /obj/item/stack/sheet/mineral/sandbags(drop_location())
+		var/obj/item/stack/sheet/mineral/sandbags/I = new (drop_location())
 		qdel(src)
 		if (Adjacent(user) && !issilicon(user))
 			user.put_in_hands(I)

code/game/objects/items/stacks/sheets/sheets.dm

@@ -16,7 +16,9 @@
 	table_type = /obj/structure/table/greyscale
 	pickup_sound = 'sound/items/handling/materials/metal_pick_up.ogg'
 	drop_sound = 'sound/items/handling/materials/metal_drop.ogg'
-	var/sheettype = null //this is used for girders in the creation of walls/false walls
+	sound_vary = TRUE
+	/// this is used for girders in the creation of walls/false walls
+	var/sheettype = null
 	///If true, this is worth points in the gulag labour stacker
 	var/gulag_valid = FALSE
 	///Set to true if this is vended from a material storage
@@ -25,8 +27,6 @@
 	var/walltype
 	/// whether this sheet can be sniffed by the material sniffer
 	var/sniffable = FALSE
-	/// this makes pickup and drop sounds vary
-	sound_vary = TRUE
 
 /obj/item/stack/sheet/Initialize(mapload, new_amount, merge = TRUE, list/mat_override=null, mat_amt=1)
 	. = ..()

code/game/objects/items/stacks/stack.dm

@@ -72,9 +72,11 @@
 	/// or until the cut heals, whichever comes first
 	var/absorption_rate
 
-/obj/item/stack/Initialize(mapload, new_amount, merge = TRUE, list/mat_override=null, mat_amt=1)
-	if(new_amount != null)
-		amount = new_amount
+/obj/item/stack/Initialize(mapload, new_amount = amount, merge = TRUE, list/mat_override=null, mat_amt=1)
+	amount = new_amount
+	if(amount <= 0)
+		stack_trace("invalid amount [amount]!")
+		return INITIALIZE_HINT_QDEL
 	while(amount > max_amount)
 		amount -= max_amount
 		new type(loc, max_amount, FALSE, mat_override, mat_amt)