if business path returns nothing for a category, do not override the category with an empty list.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@34493 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/mixin/movement_generator.py

@@ -103,8 +103,6 @@ class MovementGeneratorMixin:
           base_category, context=movement)
       if category_url not in ['', None]:
         property_dict[base_category] = [category_url]
-      else:
-        property_dict[base_category] = []
     # Amount
     if business_path.getQuantity():
       property_dict['quantity'] = business_path.getQuantity()

product/ERP5Legacy/Document/Rule.py

@@ -566,8 +566,6 @@ class Rule(Predicate, XMLObject):
           base_category, context=movement)
       if category_url not in ['', None]:
         property_dict['%s_list' % base_category] = [category_url]
-      else:
-        property_dict['%s_list' % base_category] = []
 
     # Amount
     property_dict['quantity'] = business_path.getExpectedQuantity(movement)