holosphere fixes (#7023)

## About The Pull Request
if you switch to a loadout using the change loadout verb/ability then
unused slots get replaced with a blank icon / 'nothing'
when embedding an object into a bodypart, don't try covering the object
in blood if the species has no blood
the holosphere's shell understands whatever the hologram understands,
thereby fixing things like the AI's name becoming "synthesized voice"

## Why It's Good For The Game
fixes to intended behaviour

## Changelog

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🆑
fix: if you switch to a loadout using the change loadout verb/ability
then unused slots get replaced with a blank icon / 'nothing'
fix: when embedding an object into a bodypart, don't try covering the
object in blood if the species has no blood
fix: the holosphere's shell understands whatever the hologram
understands
/🆑

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your name to the right of the first 🆑 if you want to overwrite your
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code/modules/organs/external/external.dm

@@ -1275,7 +1275,8 @@ Note that amputating the affected organ does in fact remove the infection from t
 	implants += W
 	owner.embedded_flag = 1
 	add_verb(owner, /mob/proc/yank_out_object)
-	W.add_blood(owner)
+	if(!(owner.species.species_flags & NO_BLOOD))
+		W.add_blood(owner)
 	W.forceMove(owner)
 
 /obj/item/organ/external/removed(var/mob/living/user, var/ignore_children = 0)