When a file does not exist throw an error containing the missing path
When a file does not exist throw an error containing the missing path

zont/gulp-usemin,shinygang/gulp-usemin,tsaikd/gulp-usemin,brngdsn/gulp-usemin,bassarisse/gulp-usemin,dbow/gulp-usemin,shinygang/gulp-usemin,hikirsch/gulp-usemin,hikirsch/gulp-usemin,zont/gulp-usemin,bassarisse/gulp-usemin,dbow/gulp-usemin,Frizi/gulp-pipemin,tsaikd/gulp-usemin,brngdsn/gulp-usemin,Frizi/gulp-pipemin