Don't crash when gRPC metrics are enabled without a server #295
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--grpc_prometheus
enables server and client gRPC metrics. But if we don't have a gRPC server, but callservenv.Run()
like we're doing here, the process will crash because of some uninitialized server state. Fix by moving the prom enable logic after the check to see if we actually have a server.This is still a bug upstream, so I'll send the fix there as well.