Found this link:
Also this photographer seems to specialize in Funerals:
there's another one and finally an interview with a british funeral photographer

it seems that photographing funerals is acceptable but portraits of the dead, or portraits of dead infants with their mothers like they did in the 19th century is not. It seems that in the 19th century the dead were still an integral part of the living whereas today we photograph the dead to say goodbye.