Sometimes using color pickers makes image go blank

[bjpritch]

When modifying the Near/Far colors, the image rendered in ThreeJS sometimes disappears. It seems to happen regularly for me if I:

1. Choose a new Near color.
2. Choose a new Far color.

At this point, the image goes black. If step 2 doesn't cause it to, sometimes picking a new Near color after step 2 makes it go blank.

[mwcz]

We saw some really odd behavior from datgui, where it decides to return colors in different formats, seemingly at random. It's probably returning #000000 and then after a few clicks it returns rgb(0,0,0), which ThreeJS isn't expecting. I'll look into it.