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returning None

for some odd reason I keep having problems at the Extra tests that the expected result is None and I return None as well.These cases work when I try to run it on my local desktop but not on checkio server. Anyone got a clue?

Created: April 24, 2016, 10:23 p.m.
Updated: April 25, 2016, 9:24 a.m.
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nemo9439