[tor-bugs] #31305 [Core Tor/Fallback Scripts]: Add more useful logging to fallback scripts variable config

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#31305: Add more useful logging to fallback scripts variable config
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     Reporter:  teor                       |      Owner:  teor
         Type:  defect                     |     Status:  assigned
     Priority:  Medium                     |  Milestone:
    Component:  Core Tor/Fallback Scripts  |    Version:
     Severity:  Normal                     |   Keywords:  fallback
Actual Points:                             |  Parent ID:  #29100
       Points:                             |   Reviewer:
      Sponsor:                             |
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 In #29100, nickm says:
 > As a followup, I suggest changing the definition of getvar_conf() so
 that on error, it gives a more useful explaining what the problem is, and
 changing the definition of opt() so that it turns the empty string and/or
 a missing option into None, but reports errors otherwise.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31305>
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