Fix GeoTIFF plotting in the gui
At one point Glance was able to plot GeoTIFFs in the gui as rgb images.
I think I broke that while trying to keep other errors from causing crashes when plotting. Right now if you try to plot a GeoTIFF as an rgb image, you get a message like:
"Two dimensional data is required for this plot type. The provided variable data is (1500, 1500, 3) shaped."