TG: Runtime fixes

Moved delete to trial admins because they can already mass delete and that's not
particularly as helpful as regular delete (but a lot more destructive)
Trialmins can now toggle adminhelp sounds without observing
Revision: r3397
Author: 	 quartz235

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

@@ -2425,7 +2425,7 @@ It can still be worn/put on as normal.
 	var/obj/item/device/pda/pda = wear_id
 	var/obj/item/weapon/card/id/id = wear_id
 	if (istype(pda))
-		if (pda.id)
+		if (pda.id && istype(pda.id, /obj/item/weapon/card/id))
 			. = pda.id.assignment
 		else
 			. = pda.ownjob

code/modules/mob/mob_grab.dm

@@ -89,6 +89,8 @@
 
 
 /obj/item/weapon/grab/proc/s_click(obj/screen/S as obj)
+	if (!affecting)
+		return
 	if (assailant.next_move > world.time)
 		return
 	if ((!( assailant.canmove ) || assailant.lying))

code/modules/mob/new_player/preferences.dm

@@ -545,6 +545,8 @@ datum/preferences
 
 
 	proc/process_link(mob/user, list/link_tags)
+		if(!usr)
+			return
 		if(link_tags["occ"])
 			if(link_tags["cancel"])
 				user << browse(null, "window=\ref[user]occupation")