Fix issue in item extraction when stackable is "0" instead of ""

contrib/items.py

@@ -32,7 +32,7 @@ with open("armor.txt", newline="") as f:
             "name": names[code] if code in names else row["name"],
             "class": "armor",
             "type": row["type"],
-            "stackable": bool(row["stackable"]),
+            "stackable": row["stackable"] == "1",
         }
 
 with open("weapons.txt", newline="") as f:
@@ -48,7 +48,7 @@ with open("weapons.txt", newline="") as f:
             "name": names[code] if code in names else row["name"],
             "class": "weapon",
             "type": row["type"],
-            "stackable": bool(row["stackable"]),
+            "stackable": row["stackable"] == "1",
         }
 
 with open("misc.txt", newline="") as f:
@@ -62,7 +62,7 @@ with open("misc.txt", newline="") as f:
             "name": names[code] if code in names else row["name"],
             "class": "misc",
             "type": row["type"],
-            "stackable": bool(row["stackable"]),
+            "stackable": row["stackable"] == "1",
         }
 
 for code, patch in item_patches.items():