Attach (recommended) or Link to PDF file here:
[test.pdf](https://github.com/mozilla/pdf.js/files/6270827/test.pdf)
Configuration:
- Web browser and its version:chrome 89
- Operating system and its version:win10
- PDF.js version: 2.4/2.7/2.8 no working
- Is a browser extension: no 

What is the expected behavior? (add screenshot)
![image](https://user-images.githubusercontent.com/18545199/113852392-1ae26080-97cf-11eb-9dc9-0cecf52d267b.png)

What went wrong? (add screenshot)
![1617791294(1)](https://user-images.githubusercontent.com/18545199/113852355-10c06200-97cf-11eb-8672-598750f1093a.jpg)


console this log : **FormatError: TrueType Collection does not contain "DCWGQU+CambriaMath" font** 

any solution?thanks
}
        
        if (
          properties.glyphNames &&
          (baseEncoding.length || this.differences.length)
        ) {
          for (let i = 0; i < 256; ++i) {
            if (charCodeToGlyphId[i] !== undefined) {
              continue;
            }
            glyphName = this.differences[i] || baseEncoding[i];
            if (!glyphName) {
              continue;
            }
            const glyphId = properties.glyphNames.indexOf(glyphName);
            if (glyphId > 0 && hasGlyph(glyphId)) {
              charCodeToGlyphId[i] = glyphId;
            }
          }
        }
      }
      if (charCodeToGlyphId.length === 0) {
        
        charCodeToGlyphId[0] = 0;
      }
      
      
      
      
      let glyphZeroId = numGlyphsOut - 1;