kendo-labs/knockout-kendo — pull request #70 by davegb3 (2013-05-17 08:01:39+00:00)
Title: Fix for binding directly to a null value. Issue #69

The following results in the error: TypeError : Invalid operator for "in": object expected

```javascript
var vm = { myDate : ko.observable(null) };
```

```html

```

This adds a test for the case and fixes the issue.