Don't fail parsing on empty coordinates

[cappuc]

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This change allows the parsing of kml files with empty coordinates (this can be checked on client code):

<?xml version="1.0" encoding="utf-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2">
  <Document>
    <Placemark>
      <name>test</name>
      <LineString>
        <altitudeMode>absolute</altitudeMode>
        <coordinates />
      </LineString>
    </Placemark>
  </Document>
</kml>

I have customers provided kml files with some valid Placemark and some invalid (empty coordinates like in the example).
Right now I cannot parse the file because it return an error for empty coordinates but this can be safely checked inside client code.

[pjsier]

Thanks for the PR @cappuc! Coordinates are required by the spec but I agree with you that this might be better to sort out on the client side rather than failing to parse so this makes sense.

The clippy errors are unrelated to your changes but don’t worry about those. Could you add a test for this though? Then I can take a closer look but seems like it should be good

[cappuc]

Hi @pjsier,

I added a simple test that doesn't fail with a document with empty coordinates. Do you want to add more tests or is this enough?

[pjsier]

Thanks for that update! I think we'll need to tweak the test but once that's updated we should be able to merge

[pjsier]

Thanks for making that update! This looks great, will merge and cut a new release