fix bug 875780 - Display dropdown when item is cached

To test:

1.  Go to "/docs/new"
2.  Type in the WYSIWYG the name of a document you've created, press COMMAND+K
3.  The "Article Title Lookup" field should show it in the dropdown list
4.  Close the dialog
5.  Type the same article again, press COMMAND+K again, ensure that the list pops up again.