Add override and correct default method for fromNative

- Fixes #1370

worldedit-bukkit/adapters/adapter-1_17_1/src/main/java/com/sk89q/worldedit/bukkit/adapter/ext/fawe/PaperweightAdapter.java

@@ -909,6 +909,7 @@ public final class PaperweightAdapter implements BukkitImplAdapter<net.minecraft
      * @param foreign structure to convert
      * @return non-native structure
      */
+    @Override
     public net.minecraft.nbt.Tag fromNative(Tag foreign) {
         if (foreign == null) {
             return null;

worldedit-bukkit/src/main/java/com/sk89q/worldedit/bukkit/adapter/BukkitImplAdapter.java

@@ -298,8 +298,11 @@ public interface BukkitImplAdapter<T> extends IBukkitAdapter {
     }
 
     default T fromNativeBinary(BinaryTag foreign) {
+        if (foreign == null) {
             return null;
         }
+        return fromNative(AdventureNBTConverter.fromAdventure(foreign));
+    }
 
     @Nullable
     default World createWorld(WorldCreator creator) {