[metrics-bugs] #28393 [Core Tor/Stem]: use_mirrors broken for DescriptorDownloader

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#28393: use_mirrors broken for DescriptorDownloader
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     Reporter:  irl            |      Owner:  atagar
         Type:  defect         |     Status:  new
     Priority:  Medium         |  Milestone:
    Component:  Core Tor/Stem  |    Version:
     Severity:  Normal         |   Keywords:
Actual Points:                 |  Parent ID:
       Points:                 |   Reviewer:
      Sponsor:                 |
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 When using the use_mirrors option for DescriptorDownloader, I get this:

 {{{
 Traceback (most recent call last):
   File "bushel.py", line 21, in <module>
     for desc in downloader.get_consensus().run():
   File "/usr/lib/python3/dist-packages/stem/descriptor/remote.py", line
 723, in get_consensus
     consensus_query = self.query(resource, **query_args)
   File "/usr/lib/python3/dist-packages/stem/descriptor/remote.py", line
 811, in query
     return Query(resource, **args)
   File "/usr/lib/python3/dist-packages/stem/descriptor/remote.py", line
 375, in __init__
     self.endpoints.append(stem.DirPort(endpoint[0], endpoint[1]))  # TODO:
 remove this in stem 2.0
   File "/usr/lib/python3/dist-packages/stem/__init__.py", line 571, in
 __init__
     raise ValueError("'%s' isn't a valid port" % port)
 ValueError: 'None' isn't a valid port
 }}}

 This is potentially due to relays that don't have dir ports, but this is
 just speculation.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28393>
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