mikel/mail — pull request #602 by a1exsh (2013-08-13 15:49:41+00:00)
Title: Fix NoMethodError in Part#inline? when Content-Dispostion header can't be parsed.

Invalid byte sequence in Content-Disposition field make it parse as UnstructuredField. Later, then someone calls Part.inline? (like Message#ready_to_send! does via Part#add_required_fiels) it can fail with NoMethodError on call to `disposition_type.'