Allow empty name tag in metadata

[jasper-bosch]

• [x] I agree to follow the project's code of conduct.

• [x] I added an entry to CHANGELOG.md if knowledge of this change could be valuable to users.

  I ran into an error while reading GPX files from Sports Tracker. Those files appear to contain an empty name tag (<name/>) in the metadata that results in a NoStringContent error:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<gpx xmlns="http://www.topografix.com/GPX/1/1" xmlns:gpxtpx="http://www.garmin.com/xmlschemas/TrackPointExtension/v1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" creator="Sports Tracker" version="1.1" xsi:schemaLocation="http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd http://www.garmin.com/xmlschemas/TrackPointExtension/v1 http://www.garmin.com/xmlschemas/TrackPointExtensionv1.xsd">
<metadata>
    <name/>
    <desc/>
    <author><name>Jasper</name></author>
</metadata>
<trk>
    <name/>
    <trkseg>
    <trkpt...

There's also an empty name tag within the <trk>.

When I remove the <name/> from the file I can read it without any problems.

[lnicola]

bors r+

[bors[bot]]

Build succeeded!

The publicly hosted instance of bors-ng is deprecated and will go away soon.

If you want to self-host your own instance, instructions are here. For more help, visit the forum.

If you want to switch to GitHub's built-in merge queue, visit their help page.

• ci result