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

 Good catch!

 Fix looks fine.

 Please find a test for this fix [https://gitweb.torproject.org/user/iwakeh
 /metrics-lib.git/?h=regression here]; two commits.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22634#comment:2>
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