Fix a mistake during commit procedure

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@35757 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/mixin/base_convertable.py

@@ -94,4 +94,7 @@ class BaseConvertableFileMixin:
   def _setBaseData(self, data):
     """Wrap value into Pdata
     """
-
+    if not isinstance(data, Pdata) and data is not None:
+      file = StringIO(data)
+      data, size = self._read_data(file)
+    self._baseSetBaseData(data)