Fix: Prevent crash when parsing an empty hotkey string (#17369)

Co-authored-by: seer-by-sentry[bot] <157164994+seer-by-sentry[bot]@users.noreply.github.com>

Author: seer-by-sentry[bot]

src/Files.App/Data/Commands/HotKey/HotKey.cs

@@ -278,6 +278,9 @@ public HotKey(Keys key, KeyModifiers modifier = KeyModifiers.None, bool isVisibl
 		/// <returns>Humanized code with a format <see cref="HotKey"/>.</returns>
 		public static HotKey Parse(string code, bool localized = true)
 		{
+			if (string.IsNullOrEmpty(code))
+				return None;
+
 			var key = Keys.None;
 			var modifier = KeyModifiers.None;
 			bool isVisible = true;