title: Pandas filtering off empty list
body: <p>I have a data frame that has a column 'Fruit' with something like this in it.</p>
  
  <pre><code>[u'']
  [u'']
  [u'']
  [u'' u'apple' u'Orange']
  [u'']
  [u'']
  </code></pre>
  
  <p>I want to return only the items that have the [u''].</p>
  
  <p>I have tried this using bool types and str len but there are some other places I might have an something like this</p>
  
  <p>[u'apple']</p>
  
  <pre><code>df1 = d[d['Fruit'].str.len()== 0]
  </code></pre>
  
  <p>Returns nothing because it is counting it as 1.</p>