[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:  (none)
     Type:  defect          |         Status:  reopened
 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  |  Actual Points:  0.1
Parent ID:  #24367          |         Points:  0.1
 Reviewer:                  |        Sponsor:
----------------------------+------------------------------------
Changes (by teor):

 * keywords:  030-backport, 031-backport, dos-resistance => dos-resistance
 * status:  closed => reopened
 * resolution:  fixed =>
 * parent:   => #24367


Comment:

 This was a bug on #23347, but now we're replacing uses of
 any_bridge_descriptors_known() iwith num_bridges_usable() > 0, we need to
 make this change there instead.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23524#comment:4>
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