Revert "Fix //none removing arbitrary nbt"

This reverts commit dd0bec8913.

worldedit-core/src/main/java/com/boydti/fawe/util/BrushCache.java

@@ -77,11 +77,8 @@ public final class BrushCache {
         Map<String, Tag> map;
         if (nbt == null) {
             if (tool == null) {
-                Map<String, Object> raw = nbt.getRaw();
-                if (raw.remove("weBrushJson") != null && raw.isEmpty()) {
                 item.setNbtData(null);
-                }
-                return null;
+                return tool;
             }
             nbt = new CompoundTag(map = new HashMap<>());
         } else {