Test

fix: handle zero rpc concurrency gracefully #764

Job	Run time
test-macos	2m 53s
test	1m 43s
test-conformance (benchmarks)	3m 40s
test-conformance (test-features)	3m 6s
test-conformance (test-conformance)	2m 16s
test-conformance (test-conformance-http)	2m 7s
test-conformance (test-conformance-nats)	2m 10s
test-conformance (test-conformance-nats-embedded)	2m 32s
test-conformance (test-conformance-ssl)	2m 15s
test-conformance (test-conformance-broker-http)	2m 10s
test-conformance (test-conformance-broker-redis)	2m 17s
test-conformance (test-conformance-broker-nats)	2m 16s
test-conformance (test-conformance-embedded)	2m 3s
coverage	2s
	31m 30s

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