[MIRROR] Fix cancelled allergy inputs breaking allergies (#2961)

Co-authored-by: SierraKomodo <[email protected]>
Co-authored-by: Lexanx <[email protected]>

code/modules/client/preference_setup/general/02_body.dm

@@ -701,15 +701,12 @@ var/global/list/valid_bloodtypes = list("A+", "A-", "B+", "B-", "AB+", "AB-", "O
 			for (var/severity in possible_levels)
 				LAZYSET(letterized_levels, LetterizeSeverity(severity), severity)
 			var/letterized_input = input(user, "Select the trait's level to apply.", "Select Level") as null | anything in letterized_levels
+			if (!letterized_input)
+				return
 			selected_level = letterized_levels[letterized_input]
 		else
 			selected_level = possible_levels[1]
 
-		//[SIERRA-ADD] - pr34500 - Prevents runtimes, because as of now it can be null
-		if(!selected_level)
-			return
-		//[/SIERRA-ADD]
-
 		var/additional_data
 		if (length(selected.metaoptions))
 			var/list/sanitized_metaoptions