fix(SPV-1494): panic on start up

Author: dorzepowski

engine/client.go

@@ -164,10 +164,6 @@ func NewClient(ctx context.Context, opts ...ClientOps) (ClientInterface, error)
 		return nil, err
 	}
 
-	if err = client.loadTransactionOutlinesService(); err != nil {
-		return nil, err
-	}
-
 	// Load the Notification client (if client does not exist)
 	if err = client.loadNotificationClient(ctx); err != nil {
 		return nil, err
@@ -199,6 +195,10 @@ func NewClient(ctx context.Context, opts ...ClientOps) (ClientInterface, error)
 		}
 	}
 
+	if err = client.loadTransactionOutlinesService(); err != nil {
+		return nil, err
+	}
+
 	// Return the client
 	return client, nil
 }