BIND 10 #225: b10-auth fails if ran from source tree

[BIND 10 Development]

#225: b10-auth fails if ran from source tree
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 Reporter:  jreed     |        Owner:  jelte                                         
     Type:  defect    |       Status:  reviewing                                     
 Priority:  major     |    Milestone:  05. 3rd Incremental Release: Serious Secondary
Component:  b10-auth  |   Resolution:                                                
 Keywords:            |    Sensitive:  0                                             
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Comment(by zhanglikun):

 self._db_file = new_config.get('db_file')  may make xfrout crash, If there
 isn't 'db_file' in new_config.

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Ticket URL: <https://bind10.isc.org/ticket/225#comment:10>
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