Adds a unit test to check for any missing initial icon states (#8332)

code/game/objects/items/weapons/material/ashtray.dm

@@ -1,7 +1,6 @@
 /obj/item/material/ashtray
 	name = "ashtray"
 	icon = 'icons/obj/ashtray.dmi'
-	icon_state = "blank"
 	randpixel = 5
 	force_divisor = 0.1
 	thrown_force_divisor = 0.1

code/game/objects/items/weapons/material/misc.dm

@@ -98,4 +98,4 @@
 	thrown_force_divisor = 0.04 // 5 with weight 20 (steel)
 	throw_speed = 2
 	throw_range = 3
-	w_class = 2
+	w_class = 2

code/game/objects/items/weapons/material/twohanded.dm

@@ -556,8 +556,8 @@
 	desc = "An old farming tool, not something you would find at hydroponics."
 
 /obj/item/material/twohanded/zweihander
-	icon_state = "zweihander"
-	base_icon = "zweihander"
+	icon_state = "zweihander0"
+	base_icon = "zweihander0"
 	name = "zweihander"
 	desc = "A german upgrade to the einhander models of ancient times."
 	force = 20