[Merge] lp:~phablet-team/messaging-app/fix-crash-callback into lp:messaging-app/staging

[Tiago Salem Herrmann]

Tiago Salem Herrmann has proposed merging lp:~phablet-team/messaging-app/fix-crash-callback into lp:messaging-app/staging.

Commit message:
Check if "callback" is undefined to avoid crashing the app

Requested reviews:
  Ubuntu Phablet Team (phablet-team)

For more details, see:
https://code.launchpad.net/~phablet-team/messaging-app/fix-crash-callback/+merge/321107

Check if "callback" is undefined to avoid crashing the app
-- 
Your team Ubuntu Phablet Team is requested to review the proposed merge of lp:~phablet-team/messaging-app/fix-crash-callback into lp:messaging-app/staging.
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