Fix for ConcurrentLruCache initialised with capacity = 0, previous behaviour allowed capacity = 0 (current public constructor allows it according to its javadoc)

Comment From: pivotal-cla

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Comment From: kcichonczyk

@pivotal-cla This is an Obvious Fix

Comment From: pivotal-cla

@kcichonczyk This Pull Request contains an obvious fix. Signing the Contributor License Agreement is not necessary.