convert data to string explicitly.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@24109 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Wizard/Tool/WizardTool.py

@@ -131,7 +131,8 @@ class GeneratorCall(UserDict):
     """ Encode data to transmitable text. """
     fp = StringIO()
     try:
-      xmlrpclib.Binary(data=data).encode(fp)
+      # data might be ERP5Type.Message.Message instance.
+      xmlrpclib.Binary(data=str(data)).encode(fp)
       return fp.getvalue()
     finally:
       fp.close()