[tor-bugs] #23524 [Core Tor/Tor]: Avoid crashing when we ask for running bridges, but UseBridges is 0

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#23524: Avoid crashing when we ask for running bridges, but UseBridges is 0
---------------------------------------------+-----------------------------
 Reporter:  teor                             |          Owner:  teor
     Type:  defect                           |         Status:
                                             |  needs_revision
 Priority:  Medium                           |      Milestone:  Tor:
                                             |  0.3.2.x-final
Component:  Core Tor/Tor                     |        Version:  Tor:
                                             |  0.3.0.1-alpha
 Severity:  Normal                           |     Resolution:
 Keywords:  dos-resistance, review-group-26  |  Actual Points:  0.1
Parent ID:  #24392                           |         Points:  0.1
 Reviewer:                                   |        Sponsor:
---------------------------------------------+-----------------------------
Changes (by teor):

 * parent:  #24367 => #24392


Comment:

 Yes, #24392 is assigned to you (nickm) to fix the unit tests, because I
 don't understand the guard code well enough.
 I split it off from #24367 because that ticket deals with a lot of
 different issues.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23524#comment:14>
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