Gwenview does not display a custom folder icon which is configured
by an absolute path and the folder does not contain any images.
This is caused by KIconLoader::loadMimeTypeIcon() failing for
absolute path entries. If the folder contains images the preview
job corrects the icon later.
Using KIconLoader::loadIcon() loads the correct icon.
BUG: 315983
FIXED-IN: 18.04.2