fix(admin): show placeholder when media picker image is missing#1050

wojtekpiskorz wants to merge 2 commits into

emdash-cms:mainemdash-cms/emdash:mainfrom

wojtekpiskorz:fix/media-picker-broken-image-collapsewojtekpiskorz/emdash:fix/media-picker-broken-image-collapseCopy head branch name to clipboard