make null check more obvious.
MODIFY
WalletWasabi.Gui/Controls/WalletExplorer/WalletExplorerViewModel.cs
WalletWasabi.Gui/Controls/WalletExplorer/WalletExplorerViewModel.cs
@@ -58,7 +58,7 @@ namespace WalletWasabi.Gui.Controls.WalletExplorer
Observable.FromEventPattern<Wallet>(WalletManager, nameof(WalletManager.WalletAdded))
.ObserveOn(RxApp.MainThreadScheduler)
.Select(x => x.EventArgs)
- .OfType<Wallet>()
+ .Where(x => x is { })
.Subscribe(wallet =>
{
if (wallet.State <= WalletState.Starting)

make null check more obvious.