[tor-bugs] #33433 [Metrics/Onionperf]: Add error handling for older stem versions

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#33433: Add error handling for older stem versions
---------------------------------------+------------------------------
 Reporter:  acute                      |          Owner:  metrics-team
     Type:  defect                     |         Status:  new
 Priority:  Medium                     |      Milestone:
Component:  Metrics/Onionperf          |        Version:
 Severity:  Normal                     |     Resolution:
 Keywords:  metrics-team-roadmap-2020  |  Actual Points:
Parent ID:                             |         Points:  0.5
 Reviewer:                             |        Sponsor:  Sponsor59
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Changes (by gaba):

 * keywords:   => metrics-team-roadmap-2020
 * points:   => 0.5
 * sponsor:   => Sponsor59


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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33433#comment:1>
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