fix sam crash on exit and datagram crash with no outbound tunnel

Datagram.cpp

@@ -310,7 +310,7 @@ namespace datagram
 		std::vector<i2p::tunnel::TunnelMessageBlock> send;
 		auto routingPath = GetSharedRoutingPath();
 		// if we don't have a routing path we will drop all queued messages
-		if(routingPath)
+		if(routingPath && routingPath->outboundTunnel && routingPath->remoteLease)
 		{
 			for (const auto & msg : m_SendQueue)
 			{

SAM.cpp

@@ -711,11 +711,6 @@ namespace client
 		PumpBacklog();
 	}
 
-	SAMSession::~SAMSession ()
-	{
-		i2p::client::context.DeleteLocalDestination (localDestination);
-	}
-
 	void SAMSession::AcceptI2P(std::shared_ptr<i2p::stream::Stream> stream)
 	{
 		if(!stream) return; // fail
@@ -767,18 +762,19 @@ namespace client
 
 	void SAMSession::CloseStreams ()
 	{
+		m_BacklogPumper.cancel();
 		localDestination->GetService().post([&] () {
-				std::lock_guard<std::mutex> lock(m_SocketsMutex);
+			std::lock_guard<std::mutex> lock(m_SocketsMutex);
-				for (auto& sock : m_Sockets) {
+			for (auto& sock : m_Sockets) {
-					sock->CloseStream();
+				sock->CloseStream();
-				}
+			}
-				for(auto & stream : m_Backlog) {
+			for(auto & stream : m_Backlog) {
-						stream->Close();
+				stream->Close();
-				}
+			}
-				// XXX: should this be done inside locked parts?
+			m_Sockets.clear();
-				m_Sockets.clear();
+			m_Backlog.clear();
-				m_Backlog.clear();
+			i2p::client::context.DeleteLocalDestination (localDestination);
-			});
+		});
 	}
 
 	SAMBridge::SAMBridge (const std::string& address, int port):

SAM.h

@@ -165,7 +165,6 @@ namespace client
 		}
 
 		SAMSession (std::shared_ptr<ClientDestination> dest);
-		~SAMSession ();
 
 		void AcceptI2P(std::shared_ptr<i2p::stream::Stream> stream);