D24891: Fix nullptr dereference when replying to emails without a CC header

[Volker Krause]

vkrause added reviewers: gjditchfield, knauss.

REPOSITORY
  R94 PIM: Message Library

REVISION DETAIL
  https://phabricator.kde.org/D24891

To: vkrause, gjditchfield, knauss
Cc: kde-pim, fbampaloukas, dvasin, rodsevich, winterz, vkrause, mlaurent, knauss, dvratil
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