Better handle XML parsing issues

[supersonicclay]

Repro

const xml = new DOMParser().parseFromString('<abc>', 'text/xml');
try {
  const geojson = togeojson(xml);
  console.log(geojson);
} catch (err) {
  console.error(err)
}

Actual result

{ type: 'FeatureCollection', features: [] }

Expected result

Exception thrown with error speaking to the fact that the XML is bad.

Ideas for solution

var d = new DOMParser().parseFromString('<foo>bar</foop><foot gun</foot>', 'text/xml');
Array.from(d.querySelectorAll('parsererror > div')).forEach(err => console.log(err.innerText));

Outputs: error on line 1 at column 19: Opening and ending tag mismatch: foo line 0 and foop