Attach (recommended) or Link to PDF file here:
[PDFBOX-5275-p5.pdf](https://github.com/mozilla/pdf.js/files/7109095/PDFBOX-5275-p5.pdf)

Configuration:
- Web browser and its version: FF 91.0.2
- Operating system and its version: Windows 10.0.19043.1165
- PDF.js version: latest (tried with https://mozilla.github.io/pdf.js/web/viewer.html )

Steps to reproduce the problem:
1. open the file
2.

What is the expected behavior? Displays a plant

What went wrong? Displays blank page

See also
https://issues.apache.org/jira/browse/PDFBOX-5275
which had the same problem, the cause was bad handling of an empty OCGs entry

![grafik](https://user-images.githubusercontent.com/6665575/132079956-c48921bf-6dbb-4e89-886e-4301d955ee35.png)


constructor(data) {
    this.name = null;
    this.creator = null;
    this._order = null;
    this._groups = new Map();
    if (data === null) {
      return;
    }
    this.name = data.name;
    this.creator = data.creator;
    this._order = data.order;
    for (const group of data.groups) {
      this._groups.set(
        group.id,
        new OptionalContentGroup(group.name, group.intent)
      );
    }
    if (data.baseState === "OFF") {
      for (const group of this._groups) {
        group.visible = false;
      }
    }
    for (const on of data.on) {
      this._groups.get(on).visible = true;
    }
    for (const off of data.off) {
      this._groups.get(off).visible = false;
    }
  }
  _evaluateVisibilityExpression(array) {