* Always define content_type_header if not found in message metadata

* Fix typo Content-Type != Content-type


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@35344 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/EmailDocument.py

@@ -241,7 +241,9 @@ class EmailDocument(TextDocument):
           if 'Content-Type' in kw:
             content_type_header = kw['Content-Type']
           elif 'Content-type' in kw:
-            content_type_header = kw['Content-Type']
+            content_type_header = kw['Content-type']
+          else:
+            content_type_header = ''
           file_name_list = re.findall(file_name_regexp,
                                       content_type_header,
                                       re.MULTILINE)