fix bug when attempting to read cert-manager.yaml file from assets

cmd/clusterctl/client/cluster/cert_manager.go

@@ -99,7 +99,7 @@ func (cm *certManagerClient) EnsureWebhook() error {
 	// Gets the cert-manager objects from the embedded assets.
 	objs, err := cm.getManifestObjs()
 	if err != nil {
-		return nil
+		return err
 	}
 
 	// installs the web-hook