The {{#each}} block doesn't appear to be rendering. The modal does display, I can see the modal, and inspecting it in the Chrome inspector I can see the HTML, just nothing in between the <table> elements.

gistfile1.txt

<template name="roomsList">
  <div class="modal fade">
    <div class="modal-dialog">
      <div class="modal-content">
        <div class="modal-header">
          <h4 class="modal-title">Rooms List</h4>
        </div>
        <div class="modal-body">
          <table>
            {{#each rooms}}
              <tr>
                <td>{{name}}</td>
                <td><button name="{{name}}">Join</button></td>
              </tr>
            {{/each}}
          </table>
        </div>
        <div class="modal-footer">
          <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
        </div>
      </div>
    </div>
  </div>
</template>

gistfile2.txt

  Template.body.helpers({ 
    rooms: function () {
      return Rooms.find({});
    }
  });
    
  // I tested in my client js console: Rooms.find({});
  // and I am receiving documents.