[metrics-bugs] #24012 [Metrics/Onionoo]: Fix NullPointerExceptions from accessing descriptor parts that may be null

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#24012: Fix NullPointerExceptions from accessing descriptor parts that may be null
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     Reporter:  karsten          |      Owner:  metrics-team
         Type:  defect           |     Status:  new
     Priority:  High             |  Milestone:
    Component:  Metrics/Onionoo  |    Version:
     Severity:  Normal           |   Keywords:
Actual Points:                   |  Parent ID:
       Points:                   |   Reviewer:
      Sponsor:                   |
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 There's a relay running an alternate Tor version that produces descriptors
 without "uptime" line, and the directory authorities don't include a "v"
 line for that relay, likely because its platform string does not include
 the magic word "Tor". Maybe there are similar issues.

 I'm working on a hotfix that I'll post here shortly and that needs review
 and more testing.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24012>
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