[tor-bugs] #20945 [Core Tor/Tor]: Avoid an error in the fallback script when a fallback doesn't have any uptime

[Tor Bug Tracker & Wiki]

#20945: Avoid an error in the fallback script when a fallback doesn't have any
uptime
------------------------------+--------------------------------
     Reporter:  teor          |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.3.0.x-final
    Component:  Core Tor/Tor  |    Version:  Tor: 0.2.8.1-alpha
     Severity:  Normal        |   Keywords:  fallback
Actual Points:                |  Parent ID:  #18828
       Points:  0.1           |   Reviewer:
      Sponsor:                |
------------------------------+--------------------------------
 Sometimes, the fallback generation script doesn't add attributes to the
 fallbacks in the list. If this happens, log an error, and avoid selecting
 that fallback.

 Solution in #18828.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20945>
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