cache: emit null npc ids

cache/src/main/java/net/runelite/cache/ItemManager.java

@@ -96,9 +96,8 @@ public class ItemManager implements ItemProvider
 	public void java(File java) throws IOException
 	{
 		java.mkdirs();
-		try (IDClass ids = IDClass.create(java, "ItemID"))
-		{
-			try (IDClass nulls = IDClass.create(java, "NullItemID"))
+		try (IDClass ids = IDClass.create(java, "ItemID");
+			IDClass nulls = IDClass.create(java, "NullItemID"))
 		{
 			for (ItemDefinition def : items.values())
 			{
@@ -113,7 +112,6 @@ public class ItemManager implements ItemProvider
 			}
 		}
 	}
-	}
 
 	@Override
 	public ItemDefinition provide(int itemId)

cache/src/main/java/net/runelite/cache/NpcManager.java

@@ -95,17 +95,20 @@ public class NpcManager
 	public void java(File java) throws IOException
 	{
 		java.mkdirs();
-		try (IDClass ids = IDClass.create(java, "NpcID"))
+		try (IDClass ids = IDClass.create(java, "NpcID");
+			IDClass nulls = IDClass.create(java, "NullNpcID"))
 		{
 			for (NpcDefinition def : npcs.values())
 			{
 				if (def.name.equalsIgnoreCase("NULL"))
 				{
-					continue;
+					nulls.add(def.name, def.id);
 				}
-
+				else
+				{
 					ids.add(def.name, def.id);
 				}
 			}
 		}
 	}
+}

cache/src/main/java/net/runelite/cache/ObjectManager.java

@@ -95,9 +95,8 @@ public class ObjectManager
 	public void java(File java) throws IOException
 	{
 		java.mkdirs();
-		try (IDClass ids = IDClass.create(java, "ObjectID"))
-		{
-			try (IDClass nulls = IDClass.create(java, "NullObjectID"))
+		try (IDClass ids = IDClass.create(java, "ObjectID");
+			IDClass nulls = IDClass.create(java, "NullObjectID"))
 		{
 			for (ObjectDefinition def : objects.values())
 			{
@@ -113,4 +112,3 @@ public class ObjectManager
 		}
 	}
 }
-}