Exceptions: Null Pointer and security on popup opening.

Take app from https://javafx-jira.kenai.com/browse/RT-29729 and description from that issue.

While working with the app, there is a batch of exceptions:
http://jsqalab.us.oracle.com/results/Evergreen/JavaFX/FX2.2.40/b26/FXUIControlsmanual/MacOS10.8-x64-64bit-JDK7u40b26-Hardware/workDir/javafx/scene/control/test/manual/MenuBarUseSystemMenuTest.javaMenuBarUseSystemMenuTest.html/process.err

Affected tests:
javafx/scene/control/test/manual/MenuBarUseSystemMenuTest.java

I've reviewed issues :
https://javafx-jira.kenai.com/browse/RT-29729
https://javafx-jira.kenai.com/browse/RT-29727

But it seems for me, that this issue is not fully the same as there.