Fixed AMF parser segfaulting on attempted retrieval of non-existant data.
Fixed AMF parser segfaulting on attempted retrieval of non-existant data.

DDVTECH/mistserver,rbouqueau/libdtsc_xp,DDVTECH/mistserver,DDVTECH/mistserver,DDVTECH/mistserver,rbouqueau/libdtsc_xp,rbouqueau/libdtsc_xp,DDVTECH/mistserver