DEACTIVATING LIST TOOL FOR EMPTY LIST GIVES SCRIPT ERROR

[Zoltan Koszegi]

Please load the attached file into IE9 and copy-paste its content to the CK-DEMO page and follow the steps below:
1) Click on the line beneath the list.
2) Left-arrow until you see 2+ lists in the Element Path. You will be at the end of the the second list element.
3) Press [Backspace]. -- With IE8, I got an error here.
4) For IE9 & IE10,

EITHER:

a) Click the active list tool to turn it off -> you get listNode error.

OR

b) Press [Enter] -> you get isContextFor error.

RESULT: You get a script error dialog with the following details.

listNode error:
Error: Unable to get propert 'listNode' of undefined or bull reference

isContextFor error:
Error: Unable to get property 'isContextFor' of undefined or null reference

Note: the attached file is a valid HTML.

[Zoltan Koszegi]

test file