API: Series.sum() will now return 0.0 for all-NaN series#10815

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jreback wants to merge 1 commit intopandas-dev:masterfrom

Commits on Aug 21, 2015

API: Series.sum() will now return 0.0 for all-NaN series; this is for compat with numpy >= 1.8.2 and bottleneck >= 1.0, #9422
jreback
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