[tor-bugs] #14921 [Tor]: Investigate whether we sometimes remove all predicted ports at startup

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#14921: Investigate whether we sometimes  remove all predicted ports at startup
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 Reporter:  nickm   |          Owner:
     Type:  defect  |         Status:  new
 Priority:  normal  |      Milestone:  Tor: 0.2.7.x-final
Component:  Tor     |        Version:
 Keywords:          |  Actual Points:
Parent ID:          |         Points:
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 If we have no good exits when we call choose_good_exit_server_general(),
 it appears we will remove all the predicted ports immediately.  Can this
 happen?

 Hypothesized while investigating #14918

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/14921>
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