remove unnecessary catch of FileNotFoundError (#406)
remove unnecessary catch of FileNotFoundError (#406)

FileNotFoundError is a subclass of OSError on Python 3 (wrapping errno=ENOENT),
and unavailable on Python 2.

Catching OSError already catches FileNotFoundError.
dask/distributed,amosonn/distributed,dask/distributed,dask/distributed,blaze/distributed,mrocklin/distributed,blaze/distributed,broxtronix/distributed,amosonn/distributed,dask/distributed,broxtronix/distributed,mrocklin/distributed,broxtronix/distributed,amosonn/distributed,mrocklin/distributed