8361188: Test java/awt/Mixing/AWT_Mixing/JComboBoxOverlapping.java fails on Mac OS X

[kboulanou]

Fixed an issue where null value component is not checked in class java/awt/Mixing/AWT_Mixing/OverlappingTestBase.

Also removed test java/awt/Mixing/AWT_Mixing/JComboBoxOverlapping.java from problem list file.

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 ⚠️ Dependency #25971 must be integrated first

Issue

• JDK-8361188: Test java/awt/Mixing/AWT_Mixing/JComboBoxOverlapping.java fails on Mac OS X (Sub-task - P4)

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