[tor-bugs] #21372 [Core Tor/Tor]: Don't crash when we fail to find extend info for a middle node

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#21372: Don't crash when we fail to find extend info for a middle node
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     Reporter:  teor          |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: unspecified
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  crash-resistance
Actual Points:                |  Parent ID:
       Points:  0.2           |   Reviewer:
      Sponsor:                |
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 In #21242, we eliminated a crash when we failed to find an extend info for
 a guard in onion_extend_cpath. But we left in an assert for the middle
 case. (We should also make sure the equivalent exit case is non-fatal.)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21372>
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