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[PRED-2644] Fix decoding error in case of dialect detection (#161)

* [PRED-2644] Fix decoding error in case of dialect detection

We open some file in binary mode and read some N bytes to detect encoding.
Later we use this bytes to detect dialect but before it we decode() them
into string(unicode). Because we have const number of N, it's possible that
during bytes reading last character may be torn apart and then during decode()
we can't identify that character.

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