[tor-bugs] #4500 [TorDNSEL/TorBEL]: TorBEL does not check result from TorCtl.get_router

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#4500: TorBEL does not check result from TorCtl.get_router
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 Reporter:  aagbsn           |          Owner:     
     Type:  defect           |         Status:  new
 Priority:  normal           |      Milestone:     
Component:  TorDNSEL/TorBEL  |        Version:     
 Keywords:                   |         Parent:     
   Points:                   |   Actualpoints:     
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 TorCtl.get_router may return None if no descriptor is found. TorBEL does
 not check the return value and an AttributeError exception is raised.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/4500>
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