desktop-shell: Fall back to solid color if there's no background image
diff --git a/weston-desktop-shell.ini b/weston-desktop-shell.ini
index 6553677..eeb89ad 100644
--- a/weston-desktop-shell.ini
+++ b/weston-desktop-shell.ini
@@ -1,5 +1,6 @@
 [desktop-shell]
 background-image=/usr/share/backgrounds/gnome/Aqua.jpg
+background-color=0xff002244
 panel-color=0x90ff0000
 locking=true