title: Gridster, widget doesnt render when its width is more than the width of the grid
body: <p>I use gridsterJS with a grid of 12 columns.</p>
  
  <p>I add widgets dinamycally with <code>add_widget()</code> method.</p>
  
  <p>Widgets are shown correctly. But if i put a widget with sizex of 6 or more it appears in the DOM and its height is correct but its width is 0px. </p>
  
  <p>Then the widget is present, but du to the 0px width, we cant see it visually</p>
  
  <p>In the following sample only one of the two is visible. If i change manualy the sizex from 7 to 6. Then the two widgets are ok :</p>
  
  <pre><code>&lt;ul style="position: relative; height: 180px;"&gt;
  
      &lt;li class="gs_w" style="opacity: 1; display: list-item;" data-col="1" data-row="3" data-sizex="7" data-sizey="1"&gt;&lt;/li&gt;
      &lt;li class="gs_w" style="opacity: 1; display: list-item;" data-col="1" data-row="1" data-sizex="3" data-sizey="2"&gt;&lt;/li&gt;
  
  &lt;/ul&gt;
  </code></pre>