fixed null reference exception for SetConnectedWalletAddress inside SequenceLogin.GetInstance()

Author: andygruening

Packages/Sequence-Unity/Sequence/SequenceSDK/EmbeddedWallet/SequenceLogin.cs

@@ -96,7 +96,11 @@ public SequenceLogin(IValidator validator = null, IAuthenticator authenticator =
             _connector = connector;
 
             _automaticallyFederateAccountsWhenPossible = automaticallyFederateAccountsWhenPossible;
-            SetConnectedWalletAddress(connectedWalletAddress);
+
+            if (connectedWalletAddress != null)
+            {
+                SetConnectedWalletAddress(connectedWalletAddress);
+            }
 
             bool storeSessionWallet = SequenceConfig.GetConfig(SequenceService.WaaS).StoreSessionKey() && SecureStorageFactory.IsSupportedPlatform() && connectedWalletAddress == null;
             if (storeSessionWallet)