Unexpected exceptions on many inputs

[flopp]

I ran pythonfuzz on clevercsv's detection engine, and got many input samples resulting in unexpected exceptions, e.g. a file just containing three double-quotes results in a SystemError:

clevercsv detect doublequote-doublequote-doublequote.csv 

[SystemError]
PyEval_EvalFrameEx returned a result with an error set

I'm using clevercsv 0.5.3 from pypi with Python 3.7 running on Ubuntu 19.10.

I've attached a ZIP file containing the fuzzing script and some sample input files leading to unexpected exceptions.

clevercsv-fuzzing.zip

[GjjvdBurg]

Thanks for letting me know @flopp! I'll take a look

[GjjvdBurg]

@flopp Thanks again for letting me know about this bug! It's now fixed in master and I'll prepare a release right away.