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/structures/bonfire.dm

@@ -90,7 +90,7 @@
 			bonfire_log.pixel_x += rand(1,4)
 			bonfire_log.pixel_y += rand(1,4)
 		if(can_buckle || grill)
-			new /obj/item/stack/rods(loc, 1)
+			new /obj/item/stack/rods(loc)
 		qdel(src)
 		return
 

code/game/objects/structures/curtains.dm

@@ -76,7 +76,7 @@
 /obj/structure/curtain/atom_deconstruct(disassembled = TRUE)
 	new /obj/item/stack/sheet/cloth (loc, 2)
 	new /obj/item/stack/sheet/plastic (loc, 2)
-	new /obj/item/stack/rods (loc, 1)
+	new /obj/item/stack/rods (loc)
 
 /obj/structure/curtain/play_attack_sound(damage_amount, damage_type = BRUTE, damage_flag = 0)
 	switch(damage_type)
@@ -110,7 +110,7 @@
 
 /obj/structure/curtain/cloth/atom_deconstruct(disassembled = TRUE)
 	new /obj/item/stack/sheet/cloth (loc, 4)
-	new /obj/item/stack/rods (loc, 1)
+	new /obj/item/stack/rods (loc)
 
 /obj/structure/curtain/cloth/fancy
 	icon_type = "cur_fancy"

code/game/objects/structures/girders.dm

@@ -490,7 +490,7 @@
 	return
 
 /obj/structure/girder/cult/atom_deconstruct(disassembled = TRUE)
-	new /obj/item/stack/sheet/runed_metal(drop_location(), 1)
+	new /obj/item/stack/sheet/runed_metal(drop_location())
 
 /obj/structure/girder/rcd_vals(mob/user, obj/item/construction/rcd/the_rcd)
 	switch(the_rcd.mode)

code/game/objects/structures/maintenance.dm

@@ -303,7 +303,7 @@ at the cost of risking a vicious bite.**/
 		return TRUE
 
 /obj/structure/steam_vent/atom_deconstruct(disassembled = TRUE)
-	new /obj/item/stack/sheet/iron(loc, 1)
+	new /obj/item/stack/sheet/iron(loc)
 	new /obj/item/stock_parts/water_recycler(loc, 1)
 
 /**