8326487: ZipFileSystem.getPath("").getFileName() returns null instead of an empty string

[xiaotaonan]

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In the scenario of using ZipFileSystem, when getPath("").getFileName() returns null, change getPath("").getNameCount() to 0.

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Progress

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Issue

• JDK-8326487: ZipFileSystem.getPath("").getFileName() returns null instead of an empty string (Bug - P5)

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