Initialize tokenizer in more cases

 * Fixes the crash when serializing:
     itwiki/Évaux-les-Bains?oldid=57264859

 * Follow up to 8ef23e48f712452f86b194e2a089728c8bb90e8a.

Change-Id: I3352765934a6be9ee74e56d8174609e48f9d1cae