Thx, it works. I copied a line from loadimage function itself.
func showbody(i):
if globals.loadimage(i.person.imagefull) != null:
$Panel/bodyimage.visible = true
if File.new().file_exists(i.person.imagefull.replace('bodies', 'naked')):
$Panel/bodyimage.texture = globals.loadimage(i.person.imagefull.replace('bodies', 'naked'))
else:
$Panel/bodyimage.texture = globals.loadimage(i.person.imagefull)
elif nakedspritesdict.has(i.person.unique):
...