[tor-bugs] #19553 [Metrics/Atlas]: Do not plot empty graphs

[Tor Bug Tracker & Wiki]

#19553: Do not plot empty graphs
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 Reporter:  twim           |          Owner:
     Type:  defect         |         Status:  needs_information
 Priority:  Medium         |      Milestone:
Component:  Metrics/Atlas  |        Version:
 Severity:  Normal         |     Resolution:
 Keywords:                 |  Actual Points:
Parent ID:                 |         Points:
 Reviewer:                 |        Sponsor:
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Comment (by arma):

 For completeness, the issue comes up again at
 https://lists.torproject.org/pipermail/tor-relays/2017-January/011759.html

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19553#comment:17>
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