Fix 'SVN Log...' crash while watching history in the unversioned directory....
Fix 'SVN Log...' crash while watching history in the unversioned directory. Added checks m_log variable contains anything. Summary: This commits adds checks of m_log variable contains anything before using it. More appropriate is not showing 'SVN Log...' as available action at all, this should go in a further commits. Anyway checks for a m_log variable is a must. Test Plan: Run 'SVN Log...' in unversioned directory make sure it doesn't crash any more and showes empty history. Reviewers: #dolphin, meven, elvisangelaccio Reviewed By: #dolphin, meven, elvisangelaccio Differential Revision: https://phabricator.kde.org/D29043
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