allow 0 for ISINT

Florian Schaal

2016-01-10 9d3f2bbcd5094a5ddd531c8c46a55a7133accb18

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<div class='alert alert-danger clear'>
  <div class='alert-label'><strong><tmpl_var name="error_txt"></strong></div>
  <div class='alert-content'>
    <ol>
        <li>###ERRORMSG###</li>
    </ol>
    <div>TODO: WRONG HTML ELEMENTS</div>
  </div>
</div>