fixes for potential runtimes.

code/WorkInProgress/computer3/computers/medical.dm

@@ -41,6 +41,9 @@
 		return 0
 
 	interact()
+		if(!computer.cardslot)
+			computer.Crash(MISSING_PERIPHERAL)
+			return
 		usr.set_machine(src)
 		scan = computer.cardslot.reader
 		if(!interactable())

code/WorkInProgress/computer3/computers/prisoner.dm

@@ -5,7 +5,7 @@
 	icon_state = "frame-sec"
 
 /datum/file/program/prisoner
-	name = "Prisoner Management Comsole"
+	name = "Prisoner Management Console"
 	active_state = "explosive"
 	req_access = list(access_armory)
 

code/WorkInProgress/computer3/computers/security.dm

@@ -44,10 +44,14 @@
 		return 0
 
 	interact()
+		if(!computer.cardslot)
+			computer.Crash(MISSING_PERIPHERAL)
+			return
 		usr.set_machine(src)
 		scan = computer.cardslot.reader
 		if(!interactable())
 			return
+			return
 		if (computer.z > 6)
 			usr << "\red <b>Unable to establish a connection</b>: \black You're too far away from the station!"
 			return