quicksilver/Quicksilver — pull request #1624 by skurfer (2013-09-28 13:54:09+00:00)
Title: prevent the suggested abbreviation from being `nil`

I ran across a small bug this morning introduced by #1548.

To reproduce:

1. Search for something with children (an artist from iTunes in my case).
2. Right-arrow to show the children, then select one *without typing any letters*.
3. Go to the second pane and call up “Assign Abbreviation…”.

Since there is no search text, there's an exception and the interface sort of loses its mind.