render vsphere_resource_pool only if defined

roles/kubernetes/preinstall/templates/vsphere-cloud-config.j2

@@ -14,7 +14,11 @@ server = "{{ vsphere_vcenter_ip }}"
 datacenter = "{{ vsphere_datacenter }}"
 folder = "{{ vsphere_working_dir }}"
 default-datastore = "{{ vsphere_datastore }}"
+
+{% if vsphere_resource_pool is defined and vsphere_resource_pool != ""  %}
 resourcepool-path = "{{ vsphere_resource_pool }}"
+{% endif %}
+
 
 [Disk]
 scsicontrollertype = {{ vsphere_scsi_controller_type }}