dms: Fix Image and PDF to text,html with cache (nexedi/erp5!1751).

bt5/erp5_base/DocumentTemplateItem/portal_components/document.erp5.Image.py

@@ -38,7 +38,7 @@ from Acquisition import aq_base
 
 import Products.ERP5
 from Products.ERP5Type import Permissions, PropertySheet
-from Products.ERP5Type.Utils import fill_args_from_request
+from Products.ERP5Type.Utils import bytes2str, fill_args_from_request
 from erp5.component.document.File import File
 from erp5.component.document.Document import Document, ConversionError,\
                      VALID_TEXT_FORMAT_LIST, VALID_TRANSPARENT_IMAGE_FORMAT_LIST,\
@@ -280,7 +280,8 @@ class Image(TextConvertableMixin, File, OFSImage):
 
     if format in VALID_TEXT_FORMAT_LIST:
       try:
-        return self.getConversion(format=format)
+        mime, data = self.getConversion(format=format)
+        return mime, bytes2str(data)
       except KeyError:
         mime_type, data = self._convertToText(format)
         data = aq_base(data)

bt5/erp5_dms/DocumentTemplateItem/portal_components/document.erp5.PDFDocument.py

@@ -123,7 +123,8 @@ class PDFDocument(Image):
     """
     if format == 'html':
       try:
-        return self.getConversion(format=format)
+        mime, data = self.getConversion(format=format)
+        return mime, bytes2str(data)
       except KeyError:
         mime = 'text/html'
         data = self._convertToHTML()
@@ -131,7 +132,8 @@ class PDFDocument(Image):
         return (mime, data)
     elif format in ('txt', 'text'):
       try:
-        return self.getConversion(format='txt')
+        mime, data = self.getConversion(format='txt')
+        return mime, bytes2str(data)
       except KeyError:
         mime = 'text/plain'
         data = self._convertToText()