Deleting the fisrt char of a list item removes the li element instead of the char (using Delete button). 

The issue is introduced in Q1 2016.


Steps to reproduce:
1. Open http://demos.telerik.com/aspnet-ajax/editor/examples/overview/defaultcs.aspx
2. Insert the following content in html mode:
 <ol>
    <li>123</li>
    <li>456</li>
</ol>

3. Switch to Design mode and click in the begining of the second list item (befor 4).
4. Press the Delete key

Result:
<ol>
    <li>123456</li>
</ol>

Expected
 <ol>
    <li>123</li>
    <li>56</li>
</ol>