[tor-bugs] #21430 [Metrics/Atlas]: Graphs have empty paths when bandwidth data is unavailable

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#21430: Graphs have empty paths when bandwidth data is unavailable
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     Reporter:  cypherpunks    |      Owner:  irl
         Type:  defect         |     Status:  new
     Priority:  Medium         |  Milestone:
    Component:  Metrics/Atlas  |    Version:
     Severity:  Normal         |   Keywords:
Actual Points:                 |  Parent ID:  #21274
       Points:                 |   Reviewer:
      Sponsor:                 |
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 For some relays Onionoo does not have bandwidth data for all time periods.
 For instance
 [https://onionoo.torproject.org/bandwidth?lookup=B743BE28571D87AEFF9C409756644DB5C64A7C45
 B743BE28571D87AEFF9C409756644DB5C64A7C45] is missing its 5 years data.

 When data is unavailable the graphs are empty except for the legend.
 However the path elements are still created leading to W3C validator
 errors such as

 {{{
 Element path is missing required attribute d.
 }}}

 FWICT this issue was partially addressed by #19553 but was solved by
 removing more recent graphs instead of having Atlas detect and handle
 unavailable data.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21430>
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