Giving ngramread a text file where lines are terminiated with space causes models built with this to have a missing symbol. (BER: fixed -- deals with leading and trailing spaces)
Giving ngramread a blank line causes models built with missing symbol (at least in the version I'm using).
Giving ngramprint --ARPA an FST with no symbol tables segfaults
Checking for normalized model is perhaps too exact (allow small delta) (MDR: made --norm_eps a flag for relevant binaries)
ngramread doesn't complain about missing labels if --symbols is passed (e.g. in ARPA format but in symbols file)