title: How to merge objects?
body: <p>For instance, from these two objects :</p>
  
  <pre><code>var object1 = {
    "color": "yellow",
    "size": null,
    "age": 7,
    "weight": null
  }
  
  var object2 = {
    "color": "blue",
    "size": 51,
    "age": null
  }
  </code></pre>
  
  <p>I want this (<code>object2</code> overrides <code>object1</code> except for <code>null</code> properties or properties he doesn't have):</p>
  
  <pre><code>{
    "color": "blue",
    "size": 51,
    "age": 7,
    "weight": null
  }
  </code></pre>