Fixes various runtimes (squashed)

- Fixes runtime in pod lock busters
- Fixes possessed object examination runtime
- Fixes runtime when following a destroyed mob
- Fixes to_chat runtimes from involuntary emotes
- Fixes runtimes from invalid clothing IDs
- Fixes runtime caused by wirecutting non-humans
- Fixes runtime when setting up malf AI antaghuds
- Fixes runtimes in sensory destruction reagents
- Fixes runtime caused by clientless ghosts
- Fixes antag hud runtime in autotraitor generation
- Fixes welding tool shutoff runtime
- Fixes runtime in laptops' welcome program
- Fixes to_chat runtime from mech sound effect
- Fixes runtimes in camera-using NanoUIs
- Fixes to_chat runtimes in resisting held mobs
- Fixes headless mob skeletonizing/husking runtimes
- Fixes non-mob add_logs runtime

code/modules/client/preference/preferences.dm

@@ -1219,15 +1219,15 @@ var/global/list/special_role_times = list( //minimum age (in days) for accounts
 
 						// Don't wear another species' underwear!
 						var/datum/sprite_accessory/S = underwear_list[underwear]
-						if(!(species in S.species_allowed))
+						if(!S || !(species in S.species_allowed))
 							underwear = random_underwear(gender, species)
 
 						S = undershirt_list[undershirt]
-						if(!(species in S.species_allowed))
+						if(!S || !(species in S.species_allowed))
 							undershirt = random_undershirt(gender, species)
 
 						S = socks_list[socks]
-						if(!(species in S.species_allowed))
+						if(!S || !(species in S.species_allowed))
 							socks = random_socks(gender, species)
 
 						//reset hair colour and skin colour

code/modules/computer3/computers/welcome.dm

@@ -10,7 +10,6 @@
 
 
 	interact()
-		usr.set_machine(src)
 		if(!interactable())
 			return
 		var/dat = ""

code/modules/mob/dead/observer/observer.dm

@@ -135,7 +135,7 @@ Works together with spawning an observer, noted above.
 		if(ghost.can_reenter_corpse)
 			respawnable_list += ghost
 		ghost.key = key
-		if(!ghost.client.holder && !config.antag_hud_allowed)    // For new ghosts we remove the verb from even showing up if it's not allowed.
+		if(!(ghost.client && ghost.client.holder) && !config.antag_hud_allowed)    // For new ghosts we remove the verb from even showing up if it's not allowed.
 			ghost.verbs -= /mob/dead/observer/verb/toggle_antagHUD  // Poor guys, don't know what they are missing!
 		return ghost
 
@@ -373,6 +373,9 @@ This is the proc mobs get to turn into a ghost. Forked from ghostize due to comp
 	if(!target)
 		return
 
+	if(!get_turf(target))
+		return
+
 	if(target != src)
 		if(following && following == target)
 			return

code/modules/mob/emote.dm

@@ -17,7 +17,8 @@
 /mob/proc/custom_emote(var/m_type=1,var/message = null)
 
 	if(stat || !use_me && usr == src)
-		to_chat(usr, "You are unable to emote.")
+		if(usr)
+			to_chat(usr, "You are unable to emote.")
 		return
 
 	var/muzzled = istype(src.wear_mask, /obj/item/clothing/mask/muzzle)

code/modules/mob/holder.dm

@@ -48,10 +48,10 @@
 	if(istype(M))
 		M.unEquip(src)
 		to_chat(M, "[src] wriggles out of your grip!")
-		to_chat(src, "You wriggle out of [M]'s grip!")
-	else if(istype(src.loc,/obj/item))
-		to_chat(src, "You struggle free of [src.loc].")
-		src.forceMove(get_turf(src))
+		to_chat(L, "You wriggle out of [M]'s grip!")
+	else if(istype(loc,/obj/item))
+		to_chat(L, "You struggle free of [loc].")
+		forceMove(get_turf(src))
 
 	if(istype(M))
 		for(var/atom/A in M.contents)

code/modules/mob/living/carbon/human/death.dm

@@ -144,10 +144,11 @@
 	var/obj/item/organ/external/head/H = get_organ("head")
 	if(SKELETON in src.mutations)	return
 
-	if(H.f_style)
-		H.f_style = "Shaved"
-	if(H.h_style)
-		H.h_style = "Bald"
+	if(istype(H))
+		if(H.f_style)
+			H.f_style = "Shaved"
+		if(H.h_style)
+			H.h_style = "Bald"
 	update_fhair(0)
 	update_hair(0)
 
@@ -162,10 +163,11 @@
 	var/obj/item/organ/external/head/H = organs_by_name["head"]
 	if(HUSK in mutations)	return
 
-	if(H.f_style)
-		H.f_style = "Shaved"		//we only change the icon_state of the hair datum, so it doesn't mess up their UI/UE
-	if(H.h_style)
-		H.h_style = "Bald"
+	if(istype(H))
+		if(H.f_style)
+			H.f_style = "Shaved"		//we only change the icon_state of the hair datum, so it doesn't mess up their UI/UE
+		if(H.h_style)
+			H.h_style = "Bald"
 	update_fhair(0)
 	update_hair(0)
 

code/modules/mob/living/simple_animal/posessed_object.dm

@@ -19,8 +19,8 @@
 	var/obj/item/possessed_item
 
 
-/mob/living/simple_animal/possessed_object/examine()
-	possessed_item.examine()
+/mob/living/simple_animal/possessed_object/examine(mob/user)
+	possessed_item.examine(user)
 	if(health > (maxHealth / 30))
 		to_chat(usr, "<span class='warning'>[src] appears to be floating without any support!</span>")
 	else

code/modules/spacepods/spacepod.dm

@@ -322,7 +322,7 @@
 
 	if(istype(W, /obj/item/device/lock_buster))
 		var/obj/item/device/lock_buster/L = W
-		if(L.on & equipment_system.lock_system)
+		if(L.on && equipment_system.lock_system)
 			user.visible_message(user, "<span class='warning'>[user] is drilling through the [src]'s lock!</span>",
 				"<span class='notice'>You start drilling through the [src]'s lock!</span>")
 			if(do_after(user, 100, target = src))