don't blow up

Tunnel.cpp

@@ -36,11 +36,14 @@ namespace tunnel
 	TunnelLatency::Latency TunnelLatency::GetMeanLatency() const
 	{
 		std::unique_lock<std::mutex> lock(m_access);
+		if (m_samples.size() > 0) {
 			Latency l = 0;
 			for(auto s : m_samples)
 				l += s;
 			return l / m_samples.size();
 		}
+		return 0;
+	}
 	
 	
 	Tunnel::Tunnel (std::shared_ptr<const TunnelConfig> config): 

TunnelPool.cpp

@@ -167,7 +167,7 @@ namespace tunnel
 		{	
 			if (it->IsEstablished () && it != excluded)
 			{
-				if(HasLatencyRequirement() && !it->LatencyFitsRange(m_MinLatency, m_MaxLatency)) {
+				if(HasLatencyRequirement() && it->LatencyIsKnown() && !it->LatencyFitsRange(m_MinLatency, m_MaxLatency)) {
 					i ++;
 					continue;
 				}