title: how to replace null values from database with empty string in chain for functions
body: <p>I'm using lodash and have this code right now </p>
  
  <pre><code>data: _(responseData.data)
       .pick(['title', 'layout', 'slug', 'author', 'seo', 'css', 'js'])
       .mapKeys((value, key) =&gt; _.camelCase(key))
       .value()
  </code></pre>
  
  <p>Some of the values can be returned as null from the database. I would like to replace null values with an empty string -> '' but I'm not sure how to chain another function to above chain.</p>