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/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