File: convert str fo file_object if needed

product/ERP5/bootstrap/erp5_core/DocumentTemplateItem/portal_components/document.erp5.File.py

@@ -36,6 +36,7 @@ from erp5.component.document.Document import ConversionError
 from Products.ERP5Type.Base import Base, removeIContentishInterface
 from OFS.Image import File as OFS_File
 from Products.ERP5Type.Utils import deprecated
+from cStringIO import StringIO
 
 def _unpackData(data):
   """
@@ -111,6 +112,8 @@ class File(Document, OFS_File):
       if filename:
         self._setFilename(filename)
       if file_object is not None:
+        if isinstance(file_object, str):
+            file_object = StringIO(file_object)
         # XXX: Rather than doing nothing if empty, consider changing:
         #      - _update_image_info to clear metadata
         #      - interactions to do nothing (or else?)