8229810: [macos] NullPointerException getting bounds of GraphicsConfiguration

Reviewed-by: jdv

src/java.desktop/macosx/classes/sun/awt/CGraphicsDevice.java

@@ -61,6 +61,10 @@ public final class CGraphicsDevice extends GraphicsDevice
     public CGraphicsDevice(final int displayID) {
         this.displayID = displayID;
         config = CGLGraphicsConfig.getConfig(this, displayID, 0);
+        // initializes default device state, might be redundant step since we
+        // call "displayChanged()" later anyway, but we do not want to leave the
+        // device in an inconsistent state after construction
+        displayChanged();
     }
 
     /**