suppress error if configuration file not exists

client.go

@@ -29,6 +29,9 @@ func client() {
 	nav := newNav(ui.wins[0].h)
 	app := &App{ui, nav}
 
+	if _, err := os.Stat(gConfigPath); err == nil {
+		log.Printf("reading configuration file: %s", gConfigPath)
+
 		rcFile, err := os.Open(gConfigPath)
 		if err != nil {
 			msg := fmt.Sprintf("opening configuration file: %s", err)
@@ -45,6 +48,7 @@ func client() {
 		}
 
 		// TODO: parser error check
+	}
 
 	app.ui.draw(app.nav)