[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:  needs_review
 Priority:  High             |      Milestone:
Component:  Metrics/Onionoo  |        Version:
 Severity:  Normal           |     Resolution:
 Keywords:                   |  Actual Points:
Parent ID:                   |         Points:
 Reviewer:                   |        Sponsor:
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Comment (by iwakeh):

 I tested a single run against the current collector recent directory,
 which should contain all problematic descriptors encountered during the
 last few days.

 All ant tests and checks pass.

 Unless anything else surfaces, this seems ready for merge and hotfix.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24012#comment:3>
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