ooo: fix backward compatibily + update test

also update test for unhandled libreoffice 5.2 formats

cloudooo/handler/ooo/handler.py

@@ -241,7 +241,7 @@ class Handler(object):
           continue
         if ext:
           mimetype, _ = mimetypes.guess_type("a." + ext)  # XXX never guess
-          if mimetype and mimetype != parsed_mimetype_type:
+          if mimetype:
             output_set.add((mimetype, title))
     return list(output_set)