D29043: Fix 'SVN Log...' crash while watching history in the unversioned directory. Added checks m_log variable contains anything.

[Méven Car]

meven accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R449 Plugins for Dolphin

BRANCH
  fixes-svnlog-crush (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D29043

To: nikolaik, #dolphin, meven, elvisangelaccio
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