fixed various inputs to be cancel-able

code/game/dna/genes/vg_powers.dm

@@ -240,7 +240,10 @@ Obviously, requires DNA2.
 
 /obj/effect/proc_holder/spell/targeted/remotetalk/cast(list/targets)
 	if(!ishuman(usr))	return
-	var/say = strip_html(input("What do you wish to say"))
+	var/say = input("What do you wish to say") as text|null
+	if(say == null || length(say) == 0)
+		return
+	say = strip_html(say)
 
 	for(var/mob/living/target in targets)
 		log_say("Project Mind: [key_name(usr)]->[key_name(target)]: [say]")

code/game/objects/items/weapons/explosives.dm

@@ -62,7 +62,9 @@
 		..()
 
 /obj/item/weapon/c4/attack_self(mob/user as mob)
-	var/newtime = input(usr, "Please set the timer.", "Timer", 10) as num
+	var/newtime = input(usr, "Please set the timer.", "Timer", 10) as num|null
+	if(newtime == null)
+		return
 	if(newtime < 10)
 		newtime = 10
 	if(newtime > 60000)

code/modules/admin/verbs/adminhelp.dm

@@ -18,10 +18,11 @@ var/list/adminhelp_ignored_words = list("unknown","the","a","an","of","monkey","
 	var/list/type = list("Question","Player Complaint")
 	var/selected_type = input("Pick a category.", "Admin Help", null, null) as null|anything in type
 	if(selected_type)
-		msg = input("Please enter your message.", "Admin Help", null, null) as text
+		msg = input("Please enter your message.", "Admin Help", null, null) as text|null
 
 	//clean the input msg
-	if(!msg)	return
+	if(msg == null || length(msg) == 0)
+		return
 
 	if(src.handle_spam_prevention(msg,MUTE_ADMINHELP))
 		return

code/modules/economy/EFTPOS.dm

@@ -133,8 +133,10 @@
 			if("change_id")
 				var/attempt_code = text2num(input("Re-enter the current EFTPOS access code", "Confirm EFTPOS code"))
 				if(attempt_code == access_code)
-					eftpos_name = input("Enter a new terminal ID for this device", "Enter new EFTPOS ID") + " EFTPOS scanner"
-					print_reference()
+					var name = input("Enter a new terminal ID for this device", "Enter new EFTPOS ID") as text|null
+					if(name && length(name) > 0)
+						eftpos_name = name + " EFTPOS scanner"
+						print_reference()
 				else
 					usr << "\icon[src]<span class='warning'>Incorrect code entered.</span>"
 			if("link_account")
@@ -147,7 +149,9 @@
 				else
 					usr << "\icon[src]<span class='warning'>Unable to connect to accounts database.</span>"
 			if("trans_purpose")
-				transaction_purpose = input("Enter reason for EFTPOS transaction", "Transaction purpose")
+				var/purpose = input("Enter reason for EFTPOS transaction", "Transaction purpose") as text|null
+				if(purpose && length(purpose) > 0)
+					transaction_purpose = purpose
 			if("trans_value")
 				var/try_num = input("Enter amount for EFTPOS transaction", "Transaction amount") as num
 				if(try_num < 0)