Fix NPE in ChannelPool metrics methods when pool is uninitialized#928

dkropachev merged 2 commits into

scylla-4.xscylladb/java-driver:scylla-4.xfrom

fix/customer-413-channel-pool-npe-metricsscylladb/java-driver:fix/customer-413-channel-pool-npe-metricsCopy head branch name to clipboard