If you add a link on the blogger page url option and click save arrangement the link gets wiped out and is replaced by javascript:;
temp success
if you add the url and title and click save BUT DO NOT clicks save arrangement it saves the url without wiping it off.
sadly google developers do not have a system to get feedback from end users so bugs can remain
semi fail
if you change it to javascript:window.open('http://www.google.com', '_blank');
it works partly but gives and object error when it is opened on the original url