initialize PropertyHolder attributes to avoid copy pasting code

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@42803 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/Base.py

@@ -324,6 +324,11 @@ class PropertyHolder(object):
     self.security = ClassSecurityInfo() # We create a new security info object
     self.workflow_method_registry = {}
 
+    self._categories = []
+    self._properties = []
+    self._constraints = []
+    self.constraints = []
+
   def _getItemList(self):
     return [x for x in self.__dict__.items() if x[0] not in
         PropertyHolder.RESERVED_PROPERTY_SET]