title: How to input null-value into specflow step definition table
body: <p>How can I input a null value in Specflow through a table?</p>
  
  <p>Let's look at an overly simplistic example:</p>
  
  <pre><code>When a tire is attached to a car
  | CarId | TireModel      | FabricationDate | Batch |
  | 1     | Nokian Hakka R | 2015-09-1       |       |
  </code></pre>
  
  <p>The empty string in the Batch column is interpreted as text by specflow and as such, empty string. Is there a special syntax to mark that column as null?</p>