[feature] EOM api to determine current image validity status

[whatdoineed2do]

I am writing a plug-in that wants know when a new image is selected/displayed, if the image in question has been rendered correctly.

Ie if the system does not have a supporting pixbuf then EOM displays a warning that the image is not supported. On a selection_change signal handler, the EOM window object has gives NULl gdkpixbuf objects from the eom_imagr_get_pixbuf/thimbnail() api calls. Similarly the status calls are not useful

Is there an api to determine such a condition or it's a feature to be added? If you be added can you give me pointers and I can attempt this