Allow empty name tag in metadata

[jasper-bosch]

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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+

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