XMLExportImport.py: resolve the conflict of list/tuple type value can't be...

XMLExportImport.py: resolve the conflict of list/tuple type value can't be convert into text problem.

product/ERP5Type/XMLExportImport.py

@@ -118,6 +118,9 @@ def Base_asXML(object, root=None):
             for word in value]
         sub_object.append(marshaller(value))
       elif prop_type in ('text', 'string',):
+        if type(value) in (tuple, list):
+          sub_object.text = str(value)
+        else:
           sub_object.text = unicode(escape(value), 'utf-8')
       elif prop_type != 'None':
         sub_object.text = str(value)