[tor-bugs] #24219 [Core Tor/Torflow]: Avoid aggregate.py error when no nodes are measured

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#24219: Avoid aggregate.py error when no nodes are measured
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     Reporter:  teor              |      Owner:  tom
         Type:  defect            |     Status:  new
     Priority:  Medium            |  Milestone:
    Component:  Core Tor/Torflow  |    Version:
     Severity:  Normal            |   Keywords:
Actual Points:                    |  Parent ID:
       Points:                    |   Reviewer:
      Sponsor:                    |
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 If the scanner cron runs early, errors like this can happen:
 {{{
 Traceback (most recent call last):
   File "/Users/bwauth/torflow/NetworkScanners/BwAuthority/aggregate.py",
 line 894, in <module>
     main(sys.argv)
   File "/Users/bwauth/torflow/NetworkScanners/BwAuthority/aggregate.py",
 line 798, in main
     nodes.itervalues())))
 ValueError: min() arg is an empty sequence
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24219>
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