Porter: "The installation cannot be upgraded, because it is not installed"

[jonnyry]

When a resource fails its initial installation say because of a transient network issue, it is impossible to recover using the "Update" function.

The following error is returned:

Error message: The installation cannot be upgraded, because it is not installed. Verify the installation name and namespace, and if correct, use porter install. The installation cannot be upgraded, because it is not installed. Verify the installation name and namespace, and if correct, use porter install. ; Command executed: porter upgrade "7ba7d3d6-86db-4dc7-9cf2-c68fddeaa6e0" --reference mytreacr.azurecr.io/tre-workspace-service-azuresql:v1.0.0 --param arm_environment="public" --param arm_use_msi="true" --param azuresql_identity="/subscriptions/XXXXXX/resourcegroups/rg-mytre-mgmt/providers/Microsoft.ManagedIdentity/userAssignedIdentities/id-azuresql-mytre" --param id="xxxxxx" --param sql_sku="S2 | 50 DTUs" --param storage_gb="5" --param tfstate_container_name="tfstate" --param tfstate_resource_group_name="rg-mytre-mgmt" --param tfstate_storage_account_name="mytremgmtstore" --param tre_id="mytree" --param workspace_id="6ded63ed-81c7-4758-bc63-61b0b7c86967" --force --credential-set arm_auth --credential-set aad_auth...

This behaviour was introduced in Porter 1.2.0 here:

	if !i.IsInstalled() {
		return span.Errorf("The installation cannot be upgraded, because it is not installed. Verify the installation name and namespace, and if correct, use porter install.")
	}

The RP was recently upgraded from 1.1.1 to 1.2.1.