use *default when changing type of blank card

Ticket

+commit
 

Go to "Add a card" (/new), then select a Cardtype that has a *default rule.  It does not populate the textarea with the *default initial content.

 

should work for blank cards whether new or existing.

 

http://gerry.wagn.org/new/BlogEntry vs. http://gerry.wagn.org/new then select BlogEntry (no content in the second case, but the first works).