If movement_list is empty, then return an empty list and prevent

raising exception when sorting.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@26506 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/PropertyAssignmentMovementGroup.py

@@ -52,6 +52,9 @@ class PropertyAssignmentMovementGroup(MovementGroup):
     return True, property_dict
 
   def _separate(self, movement_list):
+    if not movement_list:
+      return []
+    
     property_dict = {}
 
     for prop in self.getTestedPropertyList():

product/ERP5/Document/QuantitySignMovementGroup.py

@@ -62,6 +62,9 @@ class QuantitySignMovementGroup(MovementGroup):
     return property_dict
 
   def _separate(self, movement_list):
+    if not movement_list:
+      return []
+    
     tmp_list = [[], [], []] # -1:minus, 0:zero, 1:plus
     for movement in movement_list:
       tmp_list[cmp(movement.getQuantity(), 0)].append(movement)