[openstreetmap/openstreetmap-website] PUT /api/0.6/gpx/:id causes internal server error (#1982)

[mmd]

Easiest would be to raise some error message, if the tag content is empty:

trace.rb/update_from_xml_node
```ruby
    self.tags = pt.find("tag").collect do |tag|
      raise OSM::APIBadXMLError.new("trace", pt, "Tag value may not be empty") if tag.content.empty?
      Tracetag.new(:tag => tag.content) 
    end
```

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