Handle lookup issue when Prometheus is not present in Rancher cluster
#385
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It fixes this error:
executing "prometheus.mode" at <lookup "[monitoring.coreos.com/v1](http://monitoring.coreos.com/v1)" "Prometheus" "cattle-monitoring-system" "rancher-monitoring-prometheus">: error calling lookup: unable to get apiresource from unstructured: [monitoring.coreos.com/v1](http://monitoring.coreos.com/v1), Kind=Prometheus: the server could not find the requested resource