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, "choiceList",  true);
    this.commitOn = getStringOption(attributes.commitOn, ["select", "exit"]);
    this.id = attributes.id || "";
    this.open = getStringOption(attributes.open, [
      "userControl",
      "always",
      "multiSelect",
      "onEntry",
    ]);
    this.textEntry = getInteger({
      data: attributes.textEntry,
      defaultValue: 0,
      validate: x => x === 1,
    });
    this.use = attributes.use || "";
    this.usehref = attributes.usehref || "";
    this.border = null;
    this.extras = null;
    this.margin = null;
  }
  [$toHTML](availableSpace) {