RFR(S) 8199924: Solaris: Correctly enqueue null arguments of attach operations

[Langer, Christoph]

Hi,

may I please ask for reviews of the following small fix.

Webrev: http://cr.openjdk.java.net/~clanger/webrevs/8199924.0/
Bug: https://bugs.openjdk.java.net/browse/JDK-8199924

If one passes null arguments to the varargs of attach operations, they get swallowed on Solaris and following arguments will shift to lower positions.

Other platform implementations handle this correctly, for instance linux:  http://hg.openjdk.java.net/jdk/jdk/file/f6ad4d73c834/src/jdk.attach/linux/classes/sun/tools/attach/VirtualMachineImpl.java#l178

Thanks
Christoph

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