D24963: Prevent duplicates in url list.

[Pierre Ducroquet]

pinaraf added reviewers: mlaurent, KDE PIM.

REPOSITORY
  R201 Akregator

REVISION DETAIL
  https://phabricator.kde.org/D24963

To: pinaraf, mlaurent, #kde_pim
Cc: kde-pim, fbampaloukas, dvasin, rodsevich, winterz, vkrause, mlaurent, knauss, dvratil
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