title: How to drop columns with empty headers in Pandas?
body: <p>If I have a DF: </p>
  
  <pre><code>Name1 Name2 NUll Name3 NULL Name4
  abc   abc        null       abc
  abc   abc        null       abc
  abc   abc        null       abc
  abc   abc        null       abc
  </code></pre>
  
  <p>Can I use dropna, to keep Name3 as a column with all empty values? Yet still drop both Null columns. 
  Thank you</p>