erp5_trade: do not show quantity on Order Line view when resource is not set or has variation axes

bt5/erp5_trade/SkinTemplateItem/portal_skins/erp5_trade/Movement_isQuantityEditable.py

-"""This script is used to know if quantity can be edited by user.
-
-* If this is not a movement (line containing lines or cell), user
-cannot edit this line which is just a container, but no actual movement.
-
-* If this line has variation category list, then it means it's a line that
-will contain cell, so it's already not possible to set quantity, user have
-to create cells and set quantities on cells.
-
-* If items are used, quantity is set by the item quantity.
+"""
+This script was used to know if quantity can be edited by user.
+It is now kept for backward compatibility as it does the same as `Movement_isQuantityEnabled`.
 """
 
-if not context.isMovement():
-  return False
-
-if context.getVariationCategoryList(omit_optional_variation=1) and not 'Cell' in context.getPortalType():
-  return False
-
-return not (context.getResource() and context.getResourceValue().getAggregatedPortalTypeList())
+return context.Movement_isQuantityEnabled()

bt5/erp5_trade/SkinTemplateItem/portal_skins/erp5_trade/Movement_isQuantityEnabled.py

-return context.isMovement() and not context.getVariationCategoryList()
+"""
+This script is used to know if quantity field should be displayed to user.
+
+* If no resource is defined yet, user cannot see quantity, as we still don't
+know if resource will have variations or items.
+
+* If this is not a movement (line containing lines or cell), user cannot edit
+this line which is just a container, but no actual movement.
+
+* If the resource has variation base category list, then it means it's a line
+that will contain cell, so it's already not possible to set quantity, user have
+to create cells and set quantities on cells.
+"""
+
+if context.getResource() is None:
+  return False
+
+if not context.isMovement():
+  return False
+
+resource = context.getResourceValue()
+return ('Cell' in context.getPortalType()) or not resource.getVariationBaseCategoryList()