[tor-bugs] #20653 [Core Tor/Tor]: Test targets should gracefully handle missing dependencies

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#20653: Test targets should gracefully handle missing dependencies
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     Reporter:  chelseakomlo  |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Low           |  Milestone:
    Component:  Core Tor/Tor  |    Version:
     Severity:  Minor         |   Keywords:
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 Test targets should be able to gracefully handle situations where Stem,
 Chutney or Perl (in the case of check-spaces and check-docs) are not
 available.

 Currently none of these targets do this and just fail by either exiting
 with exit code 1 or simply running non-existing commands (which leads to
 the same result).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20653>
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