Move to folder dialog not working in 10.10.2 (Mail version 8.2 (2070.6))

The (Nostalgy4Mail) move to folder dialog seems to be broken in OS X 10.10.2 (Mail version 8.2 (2070.6)). Upon typing the 'l' key, I can see the "Message" menu flash in the menubar, but no dialog box opens. Selecting the "Message > Move to Folder . . ." menu item manually results in the same (non) behavior.

[ar7hur]

I just submitted a pull request that I think fixes it: #34

Gave your PR a try. It works great, thanks!