KmerStreamEstimate.py ZeroDivisionError when k is larger than read length

[sjackman]

Hi, Pall. When k is large than the read length, KmerStream behaves nicely and puts zeros in those rows, which suits me just fine. KmerStreamEstimate.py however throws a ZeroDivisionError. Could it also extend the row with zeros?

[pmelsted]

Will fix and replace with NA.