Application Error, BoundsErrors() on TkWindows

[kmsquire]

In an open image window, I find that I get some annoying errors if I use the mouse wheel and/or press the up arrow when the main window is initially in focus. The BoundsErrors() appear at the Julia terminal and look like

julia> error during Tk callback: 
ERROR: BoundsError()
 in getindex at range.jl:270

Simultaneously, a Tk window pops up with

I was debating whether this belonged here or in Tk.jl, but I couldn't reproduce the behavior using Winston (which I think is still using Tk).

[timholy]

Hopefully this will at least decrease those errors.

I've tagged a new version, so you can get it with Pkg.update().

[kmsquire]

Thanks!