Steps to reproduce (this PDF):
[page4.pdf](https://github.com/mozilla/pdf.js/files/5990272/page4.pdf)

````
npm install
node_modules/.bin/gulp dist-install
node examples/node/pdf2svg.js /tmp/page4.pdf
````

Error:
````
Error: Invalid SVG dimensions
    at unreachable (/tmp/pdf.js/build/dist/legacy/build/pdf.js:2086:9)
    at assert (/tmp/pdf.js/build/dist/legacy/build/pdf.js:2091:5)
    at DOMSVGFactory.create (/tmp/pdf.js/build/dist/legacy/build/pdf.js:640:24)
    at SVGGraphics._makeTilingPattern (/tmp/pdf.js/build/dist/legacy/build/pdf.js:24178:36)
    at SVGGraphics._makeColorN_Pattern (/tmp/pdf.js/build/dist/legacy/build/pdf.js:24127:23)
    at SVGGraphics.setFillColorN (/tmp/pdf.js/build/dist/legacy/build/pdf.js:24088:39)
    at SVGGraphics.executeOpTree (/tmp/pdf.js/build/dist/legacy/build/pdf.js:23634:22)
    at /tmp/pdf.js/build/dist/legacy/build/pdf.js:23508:18
    at process._tickCallback (internal/process/next_tick.js:68:7)
    at Function.Module.runMain (internal/modules/cjs/loader.js:834:11)
````
this.pendingClip = type;
    }
    closePath() {
      const current = this.current;
      if (current.path) {
        const d = `${current.path.getAttributeNS(null, "d")}Z`;
        current.path.setAttributeNS(null, "d", d);
      }
    }
    setLeading(leading) {
      this.current.leading = -leading;
    }
    setTextRise(textRise) {
      this.current.textRise = textRise;
    }
    setTextRenderingMode(textRenderingMode) {
      this.current.textRenderingMode = textRenderingMode;
    }
    setHScale(scale) {
      this.current.textHScale = scale / 100;
    }
    setRenderingIntent(intent) {
      
    }
    setFlatness(flatness) {
      
    }
    setGState(states) {