[tor-bugs] #29099 [Core Tor/Tor]: Shellcheck: chutney-git-bisect: use -n instead of ! -z

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#29099: Shellcheck: chutney-git-bisect: use -n instead of ! -z
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     Reporter:  nickm         |      Owner:  (none)
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.4.0.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29099>
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