Fixes for null command

App/Utilities/UIKeyCommand+ConvInit.swift

@@ -7,7 +7,15 @@
 
 import UIKit
 
+extension NSObject {
+    @objc fileprivate func _null() {}
+}
+
 extension UIKeyCommand {
+    public static func null() -> UIKeyCommand {
+        UIKeyCommand(modifiers: [], input: "", title: "", action: #selector(_null))
+    }
+    
     convenience init(modifiers: UIKeyModifierFlags, input: String, title: String, action: Selector) {
         self.init(input: input, modifierFlags: modifiers, action: action)
         self.title = title