Attach (recommended) or Link to PDF file here:
[occurmin0.pdf](https://github.com/mozilla/pdf.js/files/7340277/occurmin0.pdf)

Configuration:
- Web browser and its version: 95.0a1 (2021-10-13) (64-bit)
- Operating system and its version: Windows 10


Steps to reproduce the problem:
1. Open form in pdf.js

What is the expected behavior? (add screenshot)
Form is blank (subform `nomin`  does not display)
What went wrong? (add screenshot)
![image](https://user-images.githubusercontent.com/7104454/137184675-d48027c0-1f17-4faa-bc97-b45814b38e36.png)

subform `nomin` displays, even though it's subform is set to `<occur max="-1" min="0" />`

const dataChild = (child[$data] = new XmlObject(
            nsId,
            child.name || "root"
          ));
          dataNode[$appendChild](dataChild);
          this._bindElement(child, dataChild);
        }
        continue;
      }
      if (!child[$isBindable]()) {
        
        
        continue;
      }
      let global = false;
      let picture = null;
      let ref = null;
      let match = null;
      if (child.bind) {
        switch (child.bind.match) {
          case "none":
            this._setAndBind(child, dataNode);
            continue;
          case "global":
            global = true;
            break;
          case "dataRef":
            if (!child.bind.ref) {
              warn(`XFA - ref is empty in node ${child[$nodeName]}.`);
              this._setAndBind(child, dataNode);