[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 karsten):

 Replying to [comment:2 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.

 Great, thanks for the tests!  Preparing a pre-release tarball now.  Will
 post that here in 10 minutes.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22634#comment:3>
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