Ticket
better error message for forms of nonexistent types+status
better error message for forms of nonexistent types+priority
better error message for forms of nonexistent types+tag
better error message for forms of nonexistent types+commit
better error message for forms of nonexistent types+issues
URLs such as http://www.wagn.org/wagn/seth+*type return a virtual card, and the only indication that there's an error is where it tries to list cards of type seth. How about, in a class instruction div:
Oops! There's no card type called "seth".