feat(adminui-vue): adapt `UFileMultiple` for displaying of mocked value for...
feat(adminui-vue): adapt UFileMultiple for displaying of mocked value for file attribute (absent size value is the mark).
The mocking is useful for displaying some placeholder with information for items with empty file attribute
Used in the https://git-pub.intecracy.com/unitybase/ldoc/-/merge_requests/1855
Edited by Mazur Volodymyr