lmule-1.3.1 does handle requests for a hashset in
CUpDownClient::SendHashsetPacket(). If there is no such
file it does throw an exception. This exception is not
handled and due the program does abort.
I made a work-arround which seems to work for me but am
not sure it is correct in means of the protocol. (See
appended patch.) Maybe it would be better to send no
answer et all in this case.