[Mutt] #3315: search-next segfaults if previous pattern was invalid

[Mutt <fleas@xxxxxxxx>]

#3315: search-next segfaults if previous pattern was invalid
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 Reporter:  pdmef   |       Owner:  pdmef
     Type:  defect  |      Status:  new  
 Priority:  major   |   Milestone:  1.6  
Component:  mutt    |     Version:       
 Keywords:          |  
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 When doing a `<search-next>` with a previously entered pattern that threw
 an error, mutt segfault because it assumes validity on previous patterns.
 Revealed by #3314.

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Ticket URL: <http://dev.mutt.org/trac/ticket/3315>
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