8366522: CodeSource.getCodeSigners() throws NPE within empty certs

[kirill-shirokov]

The new tests cover only NPE scenarios.

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Issue

• JDK-8366522: CodeSource.getCodeSigners() throws NPE within empty certs (Bug - P4)

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[kirill-shirokov]

/covered

[bridgekeeper]

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See the Progress checklist in the description for automated requirements.

[openjdk]

@kirill-shirokov The following label will be automatically applied to this pull request:

• security

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[myankelev]

Just 1 minor comment scratch that, I'm confused :D