make session.ready work on uninit session containers

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@13965 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/switch_cpp.cpp

@@ -874,7 +874,12 @@ SWITCH_DECLARE(int) CoreSession::sleep(int ms, int sync) {
 SWITCH_DECLARE(bool) CoreSession::ready() {
 
 	this_check(false);
+
+	if (!session) {
+		return false;
+	}
 	sanity_check(false);
+
 	return switch_channel_ready(channel) != 0;
 }