[tor-bugs] #4272 [Torflow]: choose_url throws confusing exception in bw auth

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#4272: choose_url throws confusing exception in bw auth
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     Reporter:  mikeperry  |      Owner:  mikeperry
         Type:  defect     |     Status:  new
     Priority:  normal     |  Milestone:
    Component:  Torflow    |    Version:
   Resolution:             |   Keywords:
Actual Points:             |  Parent ID:
       Points:             |
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Comment (by aagbsn):

 Related to #4269

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/4272#comment:2>
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