[IE9] Inaccessible empty list item

[Garry Yao]

With IE9 standard mode:

1. Load the editor with the following input:

   <ol>
   	<li>
   		item1</li>
   	<li>
   		&nbsp;</li>
   	<li>
   		item2</li>
   </ol>
   

2. Try to move cursor into the second list item;

• Actual Result: It's impossible to access the middle list item

[Jakub Ś]

This issue has also been described in #7515

[Jakub Ś]

patch proposed by @mrfr0g

[Jakub Ś]

I have attached patch proposed by #mrfr0g. At first glance it works fine although it was not tested thoroughly.

[Jakub Ś]

I have checked this issue in IE8-11 in CKEditor 4.3.3 but didn't get this problem.

Most likely expired on master.