Simple wrong input causes NIFC to crash

[Araq]

(.nif24)

(stmts
  (proc :foo.escapedproc (params (param :x.p . unsigned\20char.c)) unsigned\20int.c . (stmts
    (ret x.p)
  ))
  4,4,"foo.nim"
  (oo ((())))
)

The problem here is that the NIF parser interprets "foo.nim" as an empty filename which is strange but according to the spec. This empty filename then causes a crash later on.