BUG: fixed chunksize guessed to 0 (py3 only). #8621
Merge branch 'fix_to_csv_issue_chunksize_8621' of https://github.com/papaloizouc/pandas into papaloizouc-fix_to_csv_issue_chunksize_8621

Conflicts:
	doc/source/whatsnew/v0.15.2.txt