[9] Review request for 8072088: [PIT] NPE in DnD tests apparently because of the fix to JDK-8061636

[Alexander Zvegintsev]

Hello,

please review the fix:
http://cr.openjdk.java.net/~azvegint/jdk/9/8072088/00/
for the issue:
https://bugs.openjdk.java.net/browse/JDK-8072088

Removed WeakReference nullification.

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Thanks,

Alexander.