fix lint

pkg/notify/channel/channel.go

@@ -127,6 +127,7 @@ func (c *aggrChannel) Send(ctx context.Context, receiver Receiver, group *route.
 	if receiver.Webhook != nil && c.webhook != nil {
 		return c.send(ctx, receiver, group, c.webhook, "webhook")
 	}
+
 	return nil
 }
 

pkg/notify/route/route_test.go

@@ -537,7 +537,7 @@ func TestConfig_Validate(t *testing.T) {
 				},
 			},
 			wantErr: true,
-			errMsg:  "invalid sub_route: invalid matcher: invalid matcher",
+			errMsg:  "invalid sub_route: invalid matchers: new label filter",
 		},
 		{
 			name: "Valid nested sub-route",