[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):

 Please review
 [https://gitweb.torproject.org/user/iwakeh/onionoo.git?h=task-24012 my
 branch task-24012].  It contains another commit for making Onionoo more
 stable when history computation fails and another commit for preventing
 NPEs when bridges don't have an uptime value.

 (There are still tests missing here.)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24012#comment:2>
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