Trying to use tokens in node preview causes many warnings

    * warning: date() expects parameter 2 to be long, string given in modules/token/token_node.inc on line 34.
    * warning: date() expects parameter 2 to be long, string given in modules/token/token_node.inc on line 35.
    * warning: date() expects parameter 2 to be long, string given in modules/token/token_node.inc on line 36.
    * warning: date() expects parameter 2 to be long, string given in modules/token/token_node.inc on line 37.
    * warning: date() expects parameter 2 to be long, string given in modules/token/token_node.inc on line 38.
    * warning: date() expects parameter 2 to be long, string given in modules/token/token_node.inc on line 39.
    * warning: date() expects parameter 2 to be long, string given in modules/token/token_node.inc on line 40.
    * warning: date() expects parameter 2 to be long, string given in modules/token/token_node.inc on line 41.
    * warning: date() expects parameter 2 to be long, string given in modules/token/token_node.inc on line 42.
    * warning: date() expects parameter 2 to be long, string given in modules/token/token_node.inc on line 43.
    * warning: date() expects parameter 2 to be long, string given in modules/token/token_node.inc on line 44.
    * warning: date() expects parameter 2 to be long, string given in modules/token/token_node.inc on line 45.

The fix is easy enough, just add in a couple of isset()'s.