[tor-bugs] #31907 [Core Tor/Tor]: Add comments to prevent recurrence of #31495

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#31907: Add comments to prevent recurrence of #31495
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     Reporter:  nickm          |      Owner:  nickm
         Type:  task           |     Status:  assigned
     Priority:  Medium         |  Milestone:  Tor: 0.4.2.x-final
    Component:  Core Tor/Tor   |    Version:
     Severity:  Normal         |   Keywords:  042-can comment
Actual Points:                 |  Parent ID:
       Points:  0              |   Reviewer:  teor
      Sponsor:  Sponsor31-can  |
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 From #31611:

 > We can document more carefully the dangers of configuration values where
 NULL and "" mean different things. (In the case of EntryNodes, NULL means
 "all nodes are included", and "" means "no nodes are included".)

 We've decided that we should do this in 0.4.2.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31907>
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