patch potential race condition requesting topic before upstream has connected

--HG--
branch : nmdc-ircfrontend

server.go

@@ -112,9 +112,6 @@ func (s *Server) RunWorker() {
 
 func (s *Server) upstreamWorker() {
 
-	// Initiate connection
-	s.upstream = s.upstreamLauncher.Connect()
-
 	// Read loop
 	for {
 		select {
@@ -208,6 +205,7 @@ func (s *Server) handleCommand(command string, args []string) {
 		s.clientRegistered = true
 
 		// Spawn upstream connection
+		s.upstream = s.upstreamLauncher.Connect()
 		go s.upstreamWorker()
 
 		// Tell the user that they themselves joined the chat channel