Bugfix: Prevent runtime error in gui.nas

Henning Stahlkerequested to merge
cherry-pick-8a6375b2 into release/2024.1

An empty directory returns a nil which must not be passed into size()

(cherry picked from commit 8a6375b2)

Co-authored-by: Henning Stahlke 6759206-henning.stahlke@users.noreply.gitlab.com

Please merge

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