revert r32063 as convert should return pdata anyway, the conversion should be...

revert r32063 as convert should return pdata anyway, the conversion should be done by convert caller. Reviewed by jerome and kazuhiko

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@32068 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/Image.py

@@ -348,9 +348,7 @@ class Image(File, OFSImage):
       except KeyError:
         mime, image = self._makeDisplayPhoto(**kw)
         self.setConversion(image, mime, **kw)
-      # Big images are cut into smaller chunks, so it's required to cast to
-      # str. See OFS/Image -> _read_data method for more informations
-      return mime, str(image.data)
+      return mime, image.data
     return self.getContentType(), self.getData()
 
   security.declareProtected(Permissions.View, 'getSearchableText')