bail out early if null is passed in
bail out early if null is passed in

toshok/echojs,toshok/echojs,carlosalberto/echo-js,carlosalberto/echo-js,carlosalberto/echo-js,carlosalberto/echo-js,carlosalberto/echo-js,toshok/echojs,toshok/echojs,toshok/echojs,toshok/echojs,toshok/echojs,toshok/echojs,carlosalberto/echo-js