Merge branch 'develop' of github.com:ethereum/cpp-ethereum into develop

libp2p/Host.cpp

@@ -668,6 +668,8 @@ bytes Host::saveNetwork() const
 		}
 	}
 
+	if (!!m_nodeTable)
+	{
 		auto state = m_nodeTable->snapshot();
 		state.sort();
 		for (auto const& s: state)
@@ -680,6 +682,7 @@ bytes Host::saveNetwork() const
 			network << s.endpoint.tcp.port() << s.id;
 			count++;
 		}
+	}
 	
 	RLPStream ret(3);
 	ret << 1 << m_alias.secret();