[7u6] Request for review: 7124551 [macosx] Once added, Menu shortcut cannot be removed

[Sergey Bylokhov]

Hi Everyone,
We should accept empty KeyEquivalent in case of shortcut removing.
This is a back port from jdk 8:
http://hg.openjdk.java.net/jdk8/awt/jdk/rev/74a1284ca75a

Bug: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7124551
Webrev can be found at: http://cr.openjdk.java.net/~serb/7124551/webrev.00/

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Best regards, Sergey.