don't create new tunnels if offline

libi2pd/Tunnel.cpp

@@ -522,7 +522,7 @@ namespace tunnel
 				}
 
 				uint64_t ts = i2p::util::GetSecondsSinceEpoch ();
-				if (ts - lastTs >= 15) // manage tunnels every 15 seconds
+				if (ts - lastTs >= 15 && i2p::transport::transports.IsOnline()) // manage tunnels every 15 seconds
 				{
 					ManageTunnels ();
 					lastTs = ts;