D17606: [WIP] Use <optional> if available.

[Daniel Vrátil]

dvratil added a comment.


  @rakuco Yes, should be OK. I don't have access to my KDE ssh key right now so feel free to revert them and push it (to Applications/18.12 branch, then merge the branch to master), otherwise, I'll push it sometime next week.

REPOSITORY
  R206 KMail

REVISION DETAIL
  https://phabricator.kde.org/D17606

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