added a new serializer - the "empty" serializer, for those widgets who don't
need a serializer (like the TooltipWidget for instance).
<?xml version="1.0" encoding="UTF-8"?>
<projectDescription>
<name>metadataplayer</name>
<comment></comment>
<projects>
</projects>
<buildSpec>
</buildSpec>
<natures>
</natures>
</projectDescription>