title: Pandas counting the null values and plotting in seaborn
body: <p>I need to plot the count plot for a data set which has blank values.I tried using</p>
  
  <pre><code>sns.countplot(x='ViolLevel',data=df1)
  </code></pre>
  
  <p>But it is plotting the values <a href="https://i.stack.imgur.com/eHb1P.png" rel="nofollow noreferrer">enter image description here</a></p>
  
  <p>But this not showing the count of the null values in the data.</p>
  
  <p>But </p>
  
  <pre><code>df1['ViolLevel'].isnull().sum() 
  </code></pre>
  
  <p>is giving me the output of 29740.</p>
  
  <p>How can I include the <code>nan</code> values in my count plot?</p>