Fix enchantments when there are less than three options

connector/src/main/java/org/geysermc/connector/inventory/EnchantingContainer.java

@@ -47,6 +47,9 @@ public class EnchantingContainer extends Container {
         geyserEnchantOptions = new GeyserEnchantOption[3];
         for (int i = 0; i < geyserEnchantOptions.length; i++) {
             geyserEnchantOptions[i] = new GeyserEnchantOption(i);
+            // Options cannot be null, so we build initial options
+            // GeyserSession can be safely null here because it's only needed for net IDs
+            enchantOptions[i] = geyserEnchantOptions[i].build(null);
         }
     }
 }

connector/src/main/java/org/geysermc/connector/inventory/GeyserEnchantOption.java

@@ -67,12 +67,8 @@ public class GeyserEnchantOption {
     }
 
     public EnchantOptionData build(GeyserSession session) {
-        if (enchantLevel == -1) {
-            // Should not be sent to the client, as it is supposed to be empty
-            return null;
-        }
         return new EnchantOptionData(xpCost, javaIndex + 16, EMPTY,
-                Collections.singletonList(new EnchantData(bedrockEnchantIndex, enchantLevel)), EMPTY,
+                enchantLevel == -1 ? EMPTY : Collections.singletonList(new EnchantData(bedrockEnchantIndex, enchantLevel)), EMPTY,
-                javaEnchantIndex == -1 ? "unknown" : ENCHANT_NAMES.get(javaEnchantIndex), session.getNextItemNetId());
+                javaEnchantIndex == -1 ? "unknown" : ENCHANT_NAMES.get(javaEnchantIndex), enchantLevel == -1 ? 0 : session.getNextItemNetId());
     }
 }