fixed randomizer tag UI rendering

com.unity.perception/Editor/Randomization/Utilities/UIElementsEditorUtilities.cs

             var fieldType = serializedObj.targetObject.GetType();
             var iterator = serializedObj.GetIterator();
             iterator.NextVisible(true);
-            iterator.NextVisible(false);
-            do
+            if (iterator.NextVisible(false))
-                var propertyField = CreatePropertyField(iterator, fieldType);
-                containerElement.Add(propertyField);
-            } while (iterator.NextVisible(false));
+                do
+                {
+                    var propertyField = CreatePropertyField(iterator, fieldType);
+                    containerElement.Add(propertyField);
+                } while (iterator.NextVisible(false));
+            }
         }
 
         /// <summary>
         public static void CreatePropertyFields(SerializedProperty property, VisualElement containerElement)
         {
             var fieldType = StaticData.GetManagedReferenceValue(property).GetType();
-
-
+            {
                 do
                 {
                     if (SerializedProperty.EqualContents(iterator, nextSiblingProperty))
                 } while (iterator.NextVisible(false));
+            }
         }
 
         /// <summary>