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)


"postSign",
      "postSubmit",
      "preExecute",
      "preOpen",
      "prePrint",
      "preSave",
      "preSign",
      "preSubmit",
      "ready",
      "validationState",
    ]);
    this.id = attributes.id || "";
    this.listen = getStringOption(attributes.listen, [
      "refOnly",
      "refAndDescendents",
    ]);
    this.name = attributes.name || "";
    this.ref = attributes.ref || "";
    this.use = attributes.use || "";
    this.usehref = attributes.usehref || "";
    this.extras = null;
    
    this.encryptData = null;
    this.execute = null;
    this.script = null;
    this.signData = null;
    this.submit = null;
  }
}
class ExData extends ContentObject {