pysal/pysal — pull request #528 by darribas (2014-10-27 13:22:41+00:00)
Title: Replacing 0 by min value in choropleths

Replacing 0 by min value in the series to be inserted in the boundaries of classified choropleths. This fixes a small bug when creating choropleths of series with negative values.

[I should have created a small branch for the PR, sorry, I didn't realize until too late. It's a very small thing nevertheless]