[Pidgin] #9242: msn_update_contact crash when msn_userlist_find_user returns NULL

[Pidgin]

#9242: msn_update_contact crash when msn_userlist_find_user returns NULL
--------------------+-------------------------------------------------------
 Reporter:  zacw    |     Owner:  khc
     Type:  defect  |    Status:  new
Component:  MSN     |   Version:     
 Keywords:          |  
--------------------+-------------------------------------------------------
 In 2.6.0mtn, when a buddy's alias is set immediately after the contact is
 added to the MSN account, a crash occurs:

 Thread 0 Crashed:
 0   libpurple                           0x008341a8 msn_update_contact +
 844
 1   libpurple                           0x00840740 msn_alias_buddy + 60
 2   libpurple                           0x0078eb50 serv_alias_buddy + 260

 msn_userlist_find_user returns NULL, which the function tried to access as
 though it weren't.

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Ticket URL: <http://developer.pidgin.im/ticket/9242>
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