Fix a few nanite runtimes (#43478)

Just some missing sanity checks.

* Fixes spreading nanites runtimes.
* Also glitch runtime.

code/modules/research/nanites/nanite_programs.dm

@@ -86,7 +86,8 @@
 	target.deactivation_code = deactivation_code
 	target.kill_code = kill_code
 	target.trigger_code = trigger_code
-	copy_extra_settings_to(target)
+	if(istype(target,src))
+		copy_extra_settings_to(target)
 
 /datum/nanite_program/proc/set_extra_setting(user, setting)
 	return

code/modules/research/nanites/nanite_programs/utility.dm

@@ -237,7 +237,11 @@
 	if(prob(10))
 		var/list/mob/living/target_hosts = list()
 		for(var/mob/living/L in oview(5, host_mob))
+			if(!(MOB_ORGANIC in L.mob_biotypes) && !(MOB_UNDEAD in L.mob_biotypes))
+				continue
 			target_hosts += L
+		if(!target_hosts.len)
+			return
 		var/mob/living/infectee = pick(target_hosts)
 		if(prob(100 - (infectee.get_permeability_protection() * 100)))
 			//this will potentially take over existing nanites!