[metrics-bugs] #22634 [Metrics/metrics-lib]: throw the true cause, if parsing exception (regression 1.8.0)

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#22634: throw the true cause, if parsing exception (regression 1.8.0)
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     Reporter:  iwakeh               |      Owner:  metrics-team
         Type:  defect               |     Status:  new
     Priority:  Medium               |  Milestone:
    Component:  Metrics/metrics-lib  |    Version:
     Severity:  Normal               |   Keywords:
Actual Points:                       |  Parent ID:
       Points:                       |   Reviewer:
      Sponsor:                       |
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 Found and fixed by Karsten in [https://gitweb.torproject.org/user/karsten
 /metrics-
 lib.git/commit/?h=regression&id=0917016f6b2ac6e383fa6862a3a530b4dcf777bc
 this branch].

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22634>
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