[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
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 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 arma):

 Replying to [comment:10 karsten]:
 > Oh, and we still need to make a final decision what to do with those new
 lines. Okay to keep them unchanged?

 I hope we choose "yes, ok to keep them unchanged". That way external
 researchers will be able to tie together usage patterns, and blocking
 patterns, to the distribution method that the bridge asked for.

 (I am still sad that we don't record (and publish) what distribution
 mechanism bridgedb picked for a bridge. Most bridges probably won't set
 this line on their own, so seeing this line won't be a substitute for
 learning what bridgedb decided to do.)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23981#comment:13>
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