fix: NullPointerException on AbstractReadContext.span #3036
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In case of a storm of requests for sessions leads to the session pool being temporarily exhausted, the session pool will return RESOURCE_EXHAUSTED errors for those requests. That error was however not propagated to any additional threads that were also waiting for the same transaction, and would cause these threads to continue with the transaction even though no valid session had been assigned. This fix ensures that the exception is also propagated to any thread waiting for the session.