RavenDB-2697

http://issues.hibernatingrhinos.com/issue/RavenDB-2697
I have changed the behavior so that when one clicks on the input text and it is empty all the auto complete option will appear.
This doesn't explain why the user didn't see the column he was searching for...
I have notice that if you delete columns they seem to disappear from the column collection and this might be the reason why the column didn't appear.