Don't throw errors when file path  given to exif_imagetype is empty.
Don't throw errors when file path  given to exif_imagetype is empty.

blueimp/jQuery-File-Upload,blueimp/jQuery-File-Upload,blueimp/jQuery-File-Upload,Verde1705/verde1705.github.io,blueimp/jQuery-File-Upload,Verde1705/verde1705.github.io,blueimp/jQuery-File-Upload,blueimp/jQuery-File-Upload