Don't destroy something if it doesn't exist.

svn path=/trunk/; revision=19632

gtk/rtp_player.c

@@ -1595,6 +1595,7 @@ remove_channel_to_window(gchar *key _U_ , rtp_channel_info_t *rci, gpointer ptr
 	gtk_widget_destroy(rci->draw_area);
 	gtk_widget_destroy(rci->scroll_window);
 	gtk_widget_destroy(rci->check_bt);
+	if (rci->separator)
 		gtk_widget_destroy(rci->separator);
 }