AbstractObject: bugfix for my fix :)
AbstractObject: bugfix for my fix :)

Partly reverting https://github.com/atk4/atk4/commit/fc2a6cac30d75af8176c0deeb8c2ecb8fe94c053
Because it failed if $default_exception='Exception'.
xepan/atk4,atk4/atk4,samratcis/atk4,atk4/atk4,svisystem/atk4,xepan/atk4,atk4/atk4,atk4/atk4,svisystem/atk4,xepan/atk4,svisystem/atk4,samratcis/atk4,samratcis/atk4