Folder: Don't include missing folders when listing folders with media

(cherry picked from commit 5742eb5a)
Signed-off-by: Hugo Beauzée-Luyssen <hugo@beauzee.fr>
5 jobs for 0.4.x in 12 minutes and 28 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #246889
debian amd64
build-linux

00:02:48

passed #246890
win32
build-win32

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passed #246891
win64
build-win64

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  Unit Tests
passed #246892
debian amd64
unit-tests-linux

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  Functional Tests
passed #246893
debian amd64
functional-tests-linux

00:02:00