[tor-bugs] #21658 [Metrics/Atlas]: Do not attempt to plot graphs when the actual request for bandwidth data failed

[Tor Bug Tracker & Wiki]

#21658: Do not attempt to plot graphs when the actual request for bandwidth data
failed
-------------------------------+-----------------
     Reporter:  irl            |      Owner:  irl
         Type:  defect         |     Status:  new
     Priority:  Low            |  Milestone:
    Component:  Metrics/Atlas  |    Version:
     Severity:  Normal         |   Keywords:
Actual Points:                 |  Parent ID:
       Points:                 |   Reviewer:
      Sponsor:                 |
-------------------------------+-----------------
 The console log reported in the blog comment was

 {{{
 17:00:04.152 TypeError: d3.select(...).node(...) is null
 mainDetailsView<.plot() main.js:169
 mainDetailsView<.render/<.success/<() main.js:220
 forEach() self-hosted:208
 b.forEach() underscore-min.js:11
 mainDetailsView<.render/<.success() main.js:210
 graphModel<.lookup_weights/xhr<() graph.js:150
 f.Callbacks/n() jquery-min.js:2
 f.Callbacks/o.fireWith() jquery-min.js:2
 w() jquery-min.js:4
 .send/d() jquery-min.js:4
 1 main.js:169:20
 }}}

 I've not verified that this is reproducible yet.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21658>
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