Look up resource templates at loot time instead of caching them on ResourceType

ResourceType.template was filled in the enum constructor, which can run
before ItemTemplate.templates is loaded, leaving it null. lootBuilding was
its only reader and threw on the first non-gold resource.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/engine/gameManager/BuildingManager.java

@@ -218,7 +218,12 @@ public enum BuildingManager {
 
                 for (mbEnums.ResourceType resourceType : EnumSet.allOf(mbEnums.ResourceType.class)) {
 
-                    if (!player.charItemManager.hasRoomInventory(resourceType.template.item_wt)) {
+                    ItemTemplate resourceTemplate = ItemTemplate.templates.get(resourceType.templateID);
+
+                    if (resourceTemplate == null)
+                        continue;
+
+                    if (!player.charItemManager.hasRoomInventory(resourceTemplate.item_wt)) {
                         ChatManager.chatSystemInfo(player, "You can not carry any more of that item.");
                         return false;
                     }