[tor-bugs] #33060 [Core Tor/sbws]: Check that consensus timestamp lists is initialied and has at list one item

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#33060: Check that consensus timestamp lists is initialied and has at list one item
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     Reporter:  juga           |      Owner:  (none)
         Type:  defect         |     Status:  new
     Priority:  Medium         |  Milestone:  sbws: 1.1.x-final
    Component:  Core Tor/sbws  |    Version:  sbws: 1.1.0
     Severity:  Normal         |   Keywords:
Actual Points:                 |  Parent ID:
       Points:  0.1            |   Reviewer:
      Sponsor:                 |
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 Working on #30909 realized that even if I realized that when checking ` if
 len(self._consensus_timestamps) >= 1`, in the case that
 `self._consensus_timestamps` wouldn't not be initialized, it'd give a type
 error.
 That doesn't currently happen because that code is call after the
 `__init__` method. It'd still be safer to to check that it's been
 initialized.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33060>
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