[Merge] lp:~phablet-team/dialer-app/fix_prefix_settings_saving into lp:dialer-app/staging

[Gustavo Pichorim Boiko]

Gustavo Pichorim Boiko has proposed merging lp:~phablet-team/dialer-app/fix_prefix_settings_saving into lp:dialer-app/staging.

Commit message:
Only try to assing previously set values if they are available.

Requested reviews:
  Ubuntu Phablet Team (phablet-team)

For more details, see:
https://code.launchpad.net/~phablet-team/dialer-app/fix_prefix_settings_saving/+merge/321995

Only try to assing previously set values if they are available.
-- 
Your team Ubuntu Phablet Team is requested to review the proposed merge of lp:~phablet-team/dialer-app/fix_prefix_settings_saving into lp:dialer-app/staging.
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