[tor-bugs] #20796 [Metrics/Torflow]: TorFlow's ScanHandler can divide by zero when there are no unmeasured nodes

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#20796: TorFlow's ScanHandler can divide by zero when there are no unmeasured nodes
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     Reporter:  teor             |      Owner:  aagbsn
         Type:  defect           |     Status:  new
     Priority:  Medium           |  Milestone:
    Component:  Metrics/Torflow  |    Version:
     Severity:  Normal           |   Keywords:
Actual Points:                   |  Parent ID:
       Points:                   |   Reviewer:
      Sponsor:                   |
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 When ScanHandler tries to convert a rank to a percent, and there are no
 unmeasured nodes, it divides by zero.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20796>
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