don't blow up

Tunnel.cpp

@@ -36,10 +36,13 @@ namespace tunnel
 	TunnelLatency::Latency TunnelLatency::GetMeanLatency() const
 	{
 		std::unique_lock<std::mutex> lock(m_access);
-		Latency l = 0;
-		for(auto s : m_samples)
-			l += s;
-		return l / m_samples.size();
+		if (m_samples.size() > 0) {
+			Latency l = 0;
+			for(auto s : m_samples)
+				l += s;
+			return l / m_samples.size();
+		}
+		return 0;
 	}
 	
 	

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;
 				}