hg: openjfx/8u-dev/rt: 8189677: RadioMenuItem fires extra NULL value in property

[ajit.ghaisas at oracle.com]

Changeset: b6f73f98582b
Author:    aghaisas
Date:      2018-04-13 12:16 +0530
URL:       http://hg.openjdk.java.net/openjfx/8u-dev/rt/rev/b6f73f98582b

8189677: RadioMenuItem fires extra NULL value in property
Reviewed-by: kcr

! modules/controls/src/main/java/javafx/scene/control/RadioMenuItem.java
! modules/controls/src/test/java/javafx/scene/control/RadioMenuItemTest.java