title: Kendo Grid JSON Not Consistant
body: <p>I have json returning from an API that is not consistant, meaning some records have "age" associated with them while others do not. </p>
  
  <p>I am trying to populate a Kendo UI Grid in order to display/manipulate the data. Unfortunately, when the records that do not have "Age" associated with them return with records that do, kendo breaks down with an error: <strong>Uncaught ReferenceError: Age is not defined</strong></p>
  
  <p>Here is the example of the working grid: <a href="http://jsfiddle.net/tmort/CVkpF/" rel="nofollow">http://jsfiddle.net/tmort/CVkpF/</a></p>
  
  <p>And here is the grid with one record returning without "Age": <a href="http://jsfiddle.net/tmort/CVkpF/1/" rel="nofollow">http://jsfiddle.net/tmort/CVkpF/1/</a> - You can see the error appear in the Console, not on the page itself.</p>
  
  <p>Is there any way I can make the grid dynamic enough to understand that age hasn't returned, set it to null, and then continue on? </p>
  
  <p>Code I'm using:</p>
  
  <pre><code>    var data = [
      {
      FirstName: 'John',
      LastName: 'Doe',
      City: 'New York City',
      Title: 'Supervisor',
      BirthDate: '1/1/1975',
      Age: '37',
      },
      {
      FirstName: 'Jane',
      LastName: 'Doe',
      City: 'Buffalo',
      Title: 'Sales Associate',
      BirthDate: '1/1/1980',
  
      }
      ]
  $(document).ready(function() {
          var grid = $("#grid").kendoGrid({
              dataSource: {
                  data: data,
                  schema: {
                      model: {
                          fields: {
                              FirstName: { type: "string" },
                              LastName: { type: "string" },
                              City: { type: "string" },
                              Title: { type: "string" },
                              BirthDate: { type: "date" },
                              Age: { type: "number" }
                          }
                      }
                  },
                  pageSize: 10
              },
              height: 500,
              scrollable: true,
              sortable: true,
              selectable: true,
              filterable: true,
              pageable: true,
              columns: [
                  {
                      field: "FirstName",
                      title: "First Name"
                  },
                  {
                      field: "LastName",
                      title: "Last Name"
                  },
                  {
                      field: "City"
                  },
                  {
                      field: "Title"
                  },
                  {
                      field: "BirthDate",
                      title: "Birth Date",
                      template: '#= kendo.toString(BirthDate,"MM/dd/yyyy") #'
                  },
                  {
                      field: "Age"
                  }
              ]
          }).data("kendoGrid");
  
      });
  </code></pre>
  
  <p>​Any help greatly appreciated. Thanks!</p>