D11972: [RenameDialog] Fix crash when renaming single items

[Elvis Angelaccio]

elvisangelaccio added reviewers: cfeck, chinmoyr, Dolphin.

REPOSITORY
  R318 Dolphin

REVISION DETAIL
  https://phabricator.kde.org/D11972

To: elvisangelaccio, cfeck, chinmoyr, #dolphin
Cc: #dolphin
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