Expected Behavior

You should not be able to drop into the color picker swatch (but we should continue to support 2.0 projects that use a hex value). /cc @ericrosenbaum for details.

Actual Behavior

Dropping a block onto set color block with color picker causes an error.

Steps to Reproduce

Drop a block into the color picker input.

Operating System and Browser

Mac, Chrome, https://ericrosenbaum.github.io/scratch-gui/extensions-oct2017/