[metrics-bugs] #23255 [Metrics/CollecTor]: Fix a bug while sanitizing bridge network statuses without entries

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#23255: Fix a bug while sanitizing bridge network statuses without entries
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 Reporter:  karsten            |          Owner:  metrics-team
     Type:  defect             |         Status:  merge_ready
 Priority:  Very High          |      Milestone:
Component:  Metrics/CollecTor  |        Version:
 Severity:  Normal             |     Resolution:
 Keywords:                     |  Actual Points:
Parent ID:                     |         Points:
 Reviewer:                     |        Sponsor:
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Changes (by iwakeh):

 * status:  needs_review => merge_ready


Comment:

 Test in 44bcd9 passes in f6e9d6.  Other checks and tests pass, too.  The
 fix looks fine.
 Ready for merge!

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23255#comment:2>
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