<Swing Dev> [8] Request for review: 7184945 [macosx] NPE in AquaComboBoxUI since jdk7u6b17, jdk8b47

[Sergey Bylokhov]

Hello,
Please review the fix for jdk 8. Fix will be pushed to jdk 7 as well.
arrowButton should be checked for null before usage  + small cleanup.

Bug: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7184945
Webrev can be found at: http://cr.openjdk.java.net/~serb/7184945/webrev.00

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Best regards, Sergey.