Updated conditions for Deselect and Unhide

Seenginx.Models/ConfigFile.cs

@@ -18,8 +18,8 @@ namespace Seenginx.Models
 		public bool CanBeDeleted { get; set; } = true;
 
 		public void Hide() { IsVisible = "is-hidden"; }
-		public void Unhide() { IsVisible = string.Empty; }
+		public void Unhide() { IsVisible = null; }
 		public void Select() { IsSelected = "isSelected"; }
-		public void Deselect() { IsSelected = string.Empty; }
+		public void Deselect() { IsSelected = null; }
 	}
 }