Apply invalid hotkey filter to interface hotkeys (#103)

pass-winmenu/src/Configuration/Classes/InterfaceConfig.cs

@@ -1,3 +1,7 @@
+using System.Collections.Generic;
+using System.Linq;
+using YamlDotNet.Serialization;
+
 namespace PassWinmenu.Configuration
 {
 	internal class InterfaceConfig
@@ -7,7 +11,8 @@ internal class InterfaceConfig
 		public double ClipboardTimeout { get; set; } = 30;
 		public bool RestoreClipboard { get; set; } = true;
 
-		public HotkeyConfig[] Hotkeys { get; set; } =
+		[YamlMember(Alias = "hotkeys")]
+		public HotkeyConfig[] UnfilteredHotkeys { get; set; } =
 		{
 			new HotkeyConfig
 			{
@@ -20,6 +25,12 @@ internal class InterfaceConfig
 				ActionString = "select-previous"
 			}
 		};
+
+		[YamlIgnore]
+		public IEnumerable<HotkeyConfig> Hotkeys => UnfilteredHotkeys
+			?.Where(h => h != null && h.Hotkey != null && h.Options != null)
+			?? Enumerable.Empty<HotkeyConfig>();
+
 		public PasswordEditorConfig PasswordEditor { get; set; } = new PasswordEditorConfig();
 		public StyleConfig Style { get; set; } = new StyleConfig();
 	}