Fix tales expression when getContentType return None

reviewed by romain

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@31598 20353a03-c40f-0410-a6d1-a30d3c3de9de

bt5/erp5_dms/ActionTemplateItem/portal_types/File/view_editor.xml

@@ -35,7 +35,9 @@
         </item>
         <item>
             <key> <string>description</string> </key>
-            <value> <string></string> </value>
+            <value>
+              <none/>
+            </value>
         </item>
         <item>
             <key> <string>icon</string> </key>
@@ -95,7 +97,7 @@
       <dictionary>
         <item>
             <key> <string>text</string> </key>
-            <value> <string>python: object is not None and not object.isWebMode() and object.getContentType().startswith(\'text/\')</string> </value>
+            <value> <string>python: object is not None and not object.isWebMode() and (object.getContentType() or \'\').startswith(\'text/\')</string> </value>
         </item>
       </dictionary>
     </pickle>

bt5/erp5_dms/bt/revision

-1052
+1056
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