Fix NPE in MetricsRequestEventListener when @PreMatching ContainerRequestFilter throws exception#159

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Fabio Hecht (fabiohecht) wants to merge 1 commit intoconfluentinc:masterfrom

fabiohecht:fix-NPE-throwing-from-prematching

Commits on Nov 12, 2019

Initialize started and wrappedRequestStream even without RequestEvent.Type.MATCHING_START being triggered (happens when exception thrown from PreMatching request filter).
Fabio Hecht, INI-DNA-DL
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