D17917: unifiedmailboxagent: Stop using std::optional.

[Raphael Kubo da Costa]

rakuco closed this revision.

REPOSITORY
  R206 KMail

REVISION DETAIL
  https://phabricator.kde.org/D17917

To: rakuco, dvratil, #freebsd
Cc: kde-pim, dvasin, rodsevich, winterz, vkrause, mlaurent, knauss, dvratil
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