Fix 'index out of bounds' exception
Fix 'index out of bounds' exception

When you try to scroll past the bottom on a window where there are more
matches than displayable real estate.

Originally submitted at: https://github.com/wincent/Command-T/pull/94

(Greg: I was unable to repro this, but it doesn't hurt to have this in
there in the context of the refactoring that I'm doing in nearby commits
to prevent scrolling.)

Signed-off-by: Greg Hurrell <79e2475f81a6317276bf7cbb3958b20d289b78df@hurrell.net>

mtimkovich/command-t,lencioni/command-t,simichaels/dotfiles,yrro/command-t,supriyantomaftuh/command-t,wincent/command-t,wincent/command-t,vrkansagara/command-t,supriyantomaftuh/command-t,1234-/command-t,simichaels/dotfiles,lencioni/command-t,besarthoxhaj/command-t,vrkansagara/command-t,wincent/command-t,1234-/command-t,yrro/command-t,mtimkovich/command-t,besarthoxhaj/command-t