[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
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 Reporter:  teor                                 |          Owner:  (none)
     Type:  defect                               |         Status:
                                                 |  needs_review
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.3.2.x-final
Component:  Core Tor/Tor                         |        Version:  Tor:
                                                 |  0.3.0.1-alpha
 Severity:  Normal                               |     Resolution:
 Keywords:  030-backport, 031-backport, dos-     |  Actual Points:  0.1
  resistance                                     |
Parent ID:                                       |         Points:  0.1
 Reviewer:                                       |        Sponsor:
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Comment (by teor):

 I added an additional commit to make sure the bug warning isn't triggered
 by the code I added in #23347.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23524#comment:2>
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