Fail to update asset page title for docx files.
TypeError (no implicit conversion of Array into String):
app/models/page/index.rb:142:in `+'
app/models/page/index.rb:142:in `update_page_terms'
app/models/page/index.rb:123:in `block in update_page_terms_in_background'
app/models/page/index.rb:122:in `update_page_terms_in_background'
app/controllers/page/title_controller.rb:18:in `update'