Gtk: Fix NRE when setting ImageView.Image to null. Fixes #312.
Gtk: Fix NRE when setting ImageView.Image to null. Fixes #312.

PowerOfCode/Eto,PowerOfCode/Eto,PowerOfCode/Eto,l8s/Eto,l8s/Eto,bbqchickenrobot/Eto-1,bbqchickenrobot/Eto-1,bbqchickenrobot/Eto-1,l8s/Eto