title: Write NoData in every line that has no data (python 3.x)
body: <p>Files look like this:</p>
  
  <pre><code>2014-01-01    a    a   a
  2014-01-01    a        a
  2014-01-01    a    a
  </code></pre>
  
  <p>i want to go through all rows and add <code>NoData</code> in empty rows:
   output should look like this:</p>
  
  <pre><code>2014-01-01    a    a   a
  2014-01-01    a    NodData    a
  2014-01-01    a    a    NoData 
  </code></pre>
  
  <p>should I open files with <code>csv reader</code>and than loop through all lines? How can I define empty cell/ row</p>