Partly resolves "Implement state copy in AST"

eraser-base/src/main/jastadd/Item.jrag

@@ -137,9 +137,10 @@ aspect ItemHandling {
   //--- setStateFromBoolean ---
   public abstract void Item.setStateFromBoolean(boolean value);
   public void ColorItem.setStateFromBoolean(boolean value) {
-    if (getState().getBrightness()==0) {
-      setBrightness(value ? 100 : 0);
+    if (getState()!=null && getState().getBrightness()!=0 && value) {
+     return;
     }
+    setBrightness(value ? 100 : 0);
   }
   public void DateTimeItem.setStateFromBoolean(boolean value) {
     // there is no good way here