allow to specify default value with sequence.get

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@3889 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/tests/Sequence.py

@@ -78,10 +78,10 @@ class Sequence:
     for k, v in kw.items():
       self._dict[k]=v
 
-  def get(self, keyword):
+  def get(self, keyword,default=None):
     if self._dict.has_key(keyword):
       return self._dict[keyword]
-    return None
+    return default
 
 class SequenceList: