Invalid output is produced for specific file, <out> element with non-existing id in xlink:href is created

[VaclavC]

Describe the bug
If I process attached file with svgo, I get invalid svg. There is an element with xlink:href attribute pointing to an element with id 'cF', which is not present in file. Inkscape and eog are fine with that, but Apache Batik is unable to process resulting svg then.

To Reproduce
Steps to reproduce the behavior:

1. Convert provided file 'svg1.svg' with svgo
2. Check the output

Expected behavior
A valid svg as output.

Screenshots
No applicable

Desktop (please complete the following information):

• SVGO Version 2.8.0 or 3.0.2, both produce invalid output

Additional information
File svg2.svg is mentioned invalid output

[SethFalco]

This issue still occurs with SVGO v3.1.0.

The removeEmptyContainers plugin drops empty symbols because they're useless, but doesn't remove references to the useless symbol.

MRE

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 630 368">
  <symbol id="z"/>
  <use href="#z" x="150" y="349"/>
</svg>

module.exports = {
  js2svg: {
    pretty: true,
    indent: 2,
  },
  plugins: [
    "removeEmptyContainers",
  ]
}