Display no image file in text mode

[obriat]

Display non image files in text mode (ls style), along the images or at the end.

At the moment I got the following error :

lsix # or lsix  *.*
montage-im6.q16: no decode delegate for this image format `JSON' @ error/constitute.c/ReadImage/580.
montage-im6.q16: missing an image filename `gif:-' @ error/montage.c/MontageImageCommand/1804.
convert-im6.q16: no decode delegate for this image format `' @ error/constitute.c/ReadImage/580.
convert-im6.q16: no images defined `sixel:-' @ error/convert.c/ConvertImageCommand/3229.