[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:
                                                 |  0.3.0.x-final
Component:  Core Tor/Tor                         |        Version:  Tor:
                                                 |  0.3.0.1-alpha
 Severity:  Normal                               |     Resolution:
 Keywords:  dos-resistance, 030-backport,        |  Actual Points:  0.1
  031-backport                                   |
Parent ID:  #24392                               |         Points:  0.1
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------
Changes (by teor):

 * keywords:  dos-resistance, review-group-26, review-group-27 => dos-
     resistance, 030-backport, 031-backport
 * status:  merge_ready => needs_revision
 * milestone:  Tor: 0.3.2.x-final => Tor: 0.3.0.x-final


Comment:

 This was fixed in #24392 in master and 0.3.2.
 We might also need to backport this to 0.3.0 and 0.3.1.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23524#comment:19>
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