Differentiate no accounting from accounting with value 0

[sebastian-luna-valero]

Short Description of the issue

See this query:

https://accounting.egi.eu/cloud/sum_elap_processors/SITE/DATE/2024/11/2024/12/custom-training.egi.eu/onlyinfrajobs/

However the following command

fedcloud-sla-monitor --user-cert cert.pem --site IISAS-FedCloud

Returns

Information for SLA TrainingInfrastructure
[ERR] IISAS-FedCloud has no accounting info for SLA TrainingInfrastructure
[OK] IISAS-FedCloud has configured {'training.egi.eu'} for SLA TrainingInfrastructure

Summary of proposed changes

Instead the output should be

Information for SLA TrainingInfrastructure
[OK] IISAS-FedCloud has accounting info for SLA TrainingInfrastructure ({'training.egi.eu'})
[OK] IISAS-FedCloud has configured {'training.egi.eu'} for SLA TrainingInfrastructure

[enolfc]

Should we use number of VMs instead of CPU hours in accounting?
See https://accounting.egi.eu/cloud/vm_num/SITE/DATE/2024/11/2024/12/custom-training.egi.eu/onlyinfrajobs/