Comment 2 for bug 143766

this happens when catalog objects with datetime attributes, but this is common problem in BTrees module

    * Module ZPublisher.Publish, line 115, in publish
    * Module ZPublisher.mapply, line 88, in mapply
    * Module ZPublisher.Publish, line 41, in call_object
    * Module Products.ZCatalog.ZCatalog, line 536, in manage_reindexIndex
    * Module Products.ZCatalog.ZCatalog, line 521, in reindexIndex
    * Module Products.CMFPlone.CatalogTool, line 329, in catalog_object
    * Module Products.ZCatalog.ZCatalog, line 565, in catalog_object
    * Module Products.ZCatalog.Catalog, line 360, in catalogObject
    * Module Products.PluginIndexes.common.UnIndex, line 243, in index_object
    * Module Products.PluginIndexes.common.UnIndex, line 270, in _index_object
    * Module Products.PluginIndexes.common.UnIndex, line 214, in insertForwardIndexEntry

TypeError: can't compare datetime.datetime to NoneType