Transaction object must always have a transaction id
    
    A Transaction object must always have a transaction id (tid) because a
    tid is how a transaction is referenced (e.g. when being stored or
    retrieved). The existing code erroneously assumed a tid only needed to
    be created if the request contained query or form parameters. This
    restriction is now removed, if the transaction id cannot be found as a
    request parameter a tid is unconditionally created.
    
    Ticket: 177
    Signed-off-by: John Dennis <jdennis@redhat.com>
    Reviewed-by: Patrick Uiterwijk <puiterwijk@redhat.com>