Add test for Preview->previewValidator when we can't save the fixed thumbnail (cherry picked from commit 0392bfc)
Add test for Preview->previewValidator when we can't save the fixed thumbnail
(cherry picked from commit 0392bfc)

leftees/galleryplus,patman15/galleryplus,patman15/galleryplus,leftees/galleryplus,leftees/galleryplus,patman15/galleryplus