L: do not warn about missing Metronome in session state

libs/ardour/session_state.cc

@@ -2049,7 +2049,9 @@ Session::set_state (const XMLNode& node, int version)
 	}
 
 	if ((child = find_named_node (node, "Click")) == 0) {
+#ifndef LIVETRAX
 		warning << _("Session: XML state has no 'Click' section") << endmsg;
+#endif
 	} else if (_click_io) {
 		setup_click_state (&node);
 	}