Attach (recommended) or Link to PDF file here:
issue13500 (in test corpus)

This regressed when landing #13566. 

What is the expected behavior? (add screenshot)
<img width="664" alt="image" src="https://user-images.githubusercontent.com/942640/122467522-7bc8aa80-cf6f-11eb-9d4d-311eb7c64fb2.png">


What went wrong? (add screenshot)
![image](https://user-images.githubusercontent.com/942640/122467565-85eaa900-cf6f-11eb-9c10-8a8686ed440c.png)


constructor(attributes) {
    super(TEMPLATE_NS_ID, "ui",  true);
    this.id = attributes.id || "";
    this.use = attributes.use || "";
    this.usehref = attributes.usehref || "";
    this.extras = null;
    this.picture = null;
    
    this.barcode = null;
    this.button = null;
    this.checkButton = null;
    this.choiceList = null;
    this.dateTimeEdit = null;
    this.defaultUi = null;
    this.imageEdit = null;
    this.numericEdit = null;
    this.passwordEdit = null;
    this.signature = null;
    this.textEdit = null;
  }
  [$toHTML](availableSpace) {