cubicweb #343385 comparing entities with dates can raise an error [resolved]
cubicweb.entity.Entity inherits from dict which define __cmp__. CubicWeb 3.2.0 changed from mx.DateTime to datetime. Comparing two entities which have a yams.Date now raises a "TypeError: can't compare datetime.date to NoneType" if one of the two entities has an empty value for that attribute.
One way to fix this would be to implement __cmp__ on entities using the main attribute for ordering.
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