deploy-opsman-vm task fails on empty resource pool param

[Edmosis]

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Issue

upgrade-ops-manager/vsphere/pipeline.yml
If the using "vcenter_cluster" param and not the "vcenter_resource_pool" the resource pool is still mapped to the deploy-opsman-vm task.
This throws an error "govc: no such VM" as the govc command on line 68 of deply-opsman-vm/task.sh will be missing an arguement;
old_opsman_path="$(govc find "${GOVC_RESOURCE_POOL}" -type m -guest.ipAddress "${OPSMAN_IP}" -runtime.powerState poweredOn)"

Context

This throws an error "govc: no such VM" as the govc command on line 68 of deply-opsman-vm/task.sh will be missing an arguement;
old_opsman_path="$(govc find "${GOVC_RESOURCE_POOL}" -type m -guest.ipAddress "${OPSMAN_IP}" -runtime.powerState poweredOn)"

Expected result

if the resource pool param is empty, use the cluster param instead for deply-opsman-vm/task.sh

Current result

during tsk deply-opsman-vm receive the following error when "Shutting down OLD OpsMgr VM..."
govc: no such VM

Steps to Reproduce

leave the param "vcenter_resource_pool:" blank when running upgrade-ops-manager/vsphere/pipeline.yml

Possible Fix

Use the vcenter_cluster param if vcenter_resource_pool is blank

Logs and Screenshots

unable to send through screenshots due to corp policies.

Importing OVA of new OpsMgr VM...
Running govc import.ova -options=opsman_settings.json /tmp/build/39dbd1bf/pivnet-opsmgr/pcf-vsphere-2.3-build.194.ova
[12-11-18 06:02:44] Uploading pivotal-ops-manager-disk1.vmdk... OK
Setting CPUs on new OpsMgr VM... /{{DC_NAME}}/ControlPlane/OpsManager-2.3.5-20181112060121
Shutting down OLD OpsMgr VM... {{ip_address}}
govc: no such VM

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