[Merge] lp:~boiko/history-service/fix_participants_on_call_ended into lp:history-service

[Gustavo Pichorim Boiko]

Gustavo Pichorim Boiko has proposed merging lp:~boiko/history-service/fix_participants_on_call_ended into lp:history-service.

Commit message:
Prevent the history-daemon from crashing in the event of an ended call not having any remote member.

Requested reviews:
  PS Jenkins bot (ps-jenkins): continuous-integration
  Ubuntu Phablet Team (phablet-team)
Related bugs:
  Bug #1458990 in history-service (Ubuntu): "history-service crash calling back number from indicator"
  https://bugs.launchpad.net/ubuntu/+source/history-service/+bug/1458990

For more details, see:
https://code.launchpad.net/~boiko/history-service/fix_participants_on_call_ended/+merge/260402

Prevent the history-daemon from crashing in the event of an ended call not having any remote member.
-- 
Your team Ubuntu Phablet Team is requested to review the proposed merge of lp:~boiko/history-service/fix_participants_on_call_ended into lp:history-service.
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