title: watson conversation service dialog node editor doesn't allow context setting
body: <p>In the Watson Conversation Service documentation says, <strong><em>"You can store information by modifying the context part of the dialog node definition in an editor. To open the editor, select the node menu and select Advanced".</em></strong> </p>
  
  <p>However, when I try modifying the dialog node per the example given in the documentation it seems that the dialog service deletes the context setting that I added. </p>
  
  <p>Here's the example in the doc:</p>
  
  <pre><code>"context":
  {
    "my_dessert_string": "ice-cream",  
    "toppings_array": ["onion", "olives"],
    "age_number": 18,
    "complex_object": {
       "user_firstname" : "Peter",
       "user_lastname" : "Pan",
       "has_card" : false    
     }
  }
  </code></pre>
  
  <p>I go into the "advanced response" dialog node editor and add the above to the node, but after I "try it out" it's not there anymore.  </p>
  
  <p>What am I doing wrong, and what is the correct way to set context variables in a dialog node with Watson Conversation Service?</p>
  
  <p>Many thanks!</p>