title: Laravel migration, set default as empty?
body: <p>Is there anyway to set default value of a table field as ''?</p>
  
  <p>We can set default value of a field as NULL using the below code.</p>
  
  <pre><code>$table-&gt;string('reason', 32)-&gt;default(NULL);
  </code></pre>
  
  <p>Instead of that, i would like to set default of the field as <strong>''</strong> (Empty string).  How can we do that?</p>