New table default inserts into the first list item after losing editor focus in IE8

[NickMcL]

This bug deals with the new tables in list feature added in #404.

When working in a list, changing the focus away from the editor by clicking outside of the editor followed by inserting a table using the insert table tool can cause the new table to default insert into the first list item regardless of the previous selection. The correct behavior would either be to insert the table at the end of the document or to at least insert the table at the point of the previous select before the editor lost focus.

This behavior seems to consistently occur in IE8, but it does not seem to occur in Firefox 21 or Chrome 27 (Although the table is inserted at the point of the previous selection before the editor lost focus in those browsers rather than at the end of the document).

To reproduce:

1. Start with just a list, like what happens at the end of this unit test run.
2. Clear your selection by clicking outside of the editor iframe
3. Click the dialog to insert a table