[metrics-bugs] #34208 [Metrics/Onionperf]: Onionperf errors when no subcommand is given (python3)

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#34208: Onionperf errors when no subcommand is given (python3)
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     Reporter:  acute              |      Owner:  metrics-team
         Type:  defect             |     Status:  new
     Priority:  Very Low           |  Milestone:
    Component:  Metrics/Onionperf  |    Version:
     Severity:  Normal             |   Keywords:
Actual Points:                     |  Parent ID:
       Points:                     |   Reviewer:
      Sponsor:                     |
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 Not a major issue by any means, but OP errors when ran without any
 arguments. This seems to be a behaviour change from Python2 to Python3.
 The expected behaviour was previously to print help.
 {{{
 ~/onionperf$ onionperf
 Traceback (most recent call last):
   File "/usr/local/bin/onionperf", line 532, in <module>
     if __name__ == '__main__': sys.exit(main())
   File "/usr/local/bin/onionperf", line 351, in main
     args.func(args)
 AttributeError: 'Namespace' object has no attribute 'func'
 }}}
 I've attached a patch to get back that behaviour. See also
 https://bugs.python.org/issue16308.

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