wadl claims team_owner_link is required

[Jelmer Vernooij]

The WADL schema claims that the "team_owner_link" is required for the person-full representation. However, this field is actually absent in Launchpad's own replies:

        <wadl:param style="plain" required="true" name="team_owner_link" path="$['team_owner_link']">
          <wadl:doc xmlns="http://www.w3.org/1999/xhtml">
  Team Owner
  </wadl:doc>
          <wadl:link resource_type="https://api.launchpad.net/1.0/#person"/>
        </wadl:param>