Ensure pool entry is not null when instrumenting it #867
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…le creating it then hikari will return null) when instrumenting it after creation
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If an exception is thrown in the createPoolEntry method in the HikariPool then null will be returned (https://github.com/brettwooldridge/HikariCP/blob/dev/src/main/java/com/zaxxer/hikari/pool/HikariPool.java#L507).
This causes a NPE in the instrumentation which swallows the original exception eventually.
Fixes: #662