[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:  needs_review
 Priority:  High               |      Milestone:
Component:  Metrics/CollecTor  |        Version:
 Severity:  Normal             |     Resolution:
 Keywords:                     |  Actual Points:
Parent ID:                     |         Points:
 Reviewer:                     |        Sponsor:
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Comment (by iwakeh):

 Yes, let's keep the `bridge-distribution-request ...` lines. (Might be
 tidier on a new ticket as I overlooked it.)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23981#comment:15>
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