[entity] do not raise an AssertionError if the kwargs given to set_relations/attributes is empty Regression was introduced in 3.16 with the new cw_set API. Old set_relations and set_attributes methods did not crash on empty kwargs. Closes #3104019.

     1

<div id="ajaxroot">

     2

  <div class="ajaxHtmlHead">

     3

    <script src="http://foo.js" type="text/javascript"> </script>

     4

    <link rel="stylesheet" type="text/css" media="all" href="qunit.css" />

     5

  </div>

     6

  <h1>Hello</h1>

     7

</div>