[tor-bugs] #23981 [Metrics/CollecTor]: Fix NPE and include "bridge-distribution-request" lines in sanitized bridge descriptors

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#23981: Fix NPE and include "bridge-distribution-request" lines in sanitized bridge
descriptors
-------------------------------+--------------------------
 Reporter:  karsten            |          Owner:  iwakeh
     Type:  defect             |         Status:  accepted
 Priority:  High               |      Milestone:
Component:  Metrics/CollecTor  |        Version:
 Severity:  Normal             |     Resolution:
 Keywords:                     |  Actual Points:
Parent ID:                     |         Points:
 Reviewer:                     |        Sponsor:
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Comment (by karsten):

 Looks like this issue is caused by a server descriptor produced by an
 alternate Tor implementation that identifies itself as `"platform Pearl
 0fd5756 on Linux"`. And that implementation uses a different order of
 elements in its descriptor.

 I'll start working on a fix now. If you started working on a fix, too, and
 would rather continue with that, let's meet on the meeting pad.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23981#comment:9>
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