Weird error message installing a not yet valid certificate

Brief Description
-----------------
Running a restore on a VM, the playbook failed with a cryptic error message trying to reinstall the certificates from the backup. Retrying to install the certificates directly on the CLI rendered the same error message:

[sysadmin@controller-0 ~(keystone_admin)]$ system certificate-install -m ssl_ca /tmp/ca-cert.pem
Certificate /tmp/ca-cert.pem not installed: Expecting value: line 1 column 1 (char 0)

After I perceived that the VM date was behind the certificate start_date, but the error message needs improvement.

Severity
--------
Minor: System/Feature is usable with minor issue

Steps to Reproduce
------------------
-Create a certificate
-Take a backup
-Revert VM
-Restore backup

Alternatively, just generate the certificate and set the system date to something before the start_date before issuing certificate-install

Expected Behavior
------------------
certificate-install fails with a meaningful message

Actual Behavior
----------------
Message is just "Certificate /tmp/ca-cert.pem not installed: Expecting value: line 1 column 1 (char 0)"

Reproducibility
---------------
4/4

System Configuration
--------------------
AIO-SX

Branch/Pull Time/Commit
-----------------------
2022-08-25

Last Pass
---------
N/A

Timestamp/Logs
--------------
[sysadmin@controller-0 ~(keystone_admin)]$ system certificate-install -m ssl_ca /tmp/ca-cert.pem
Certificate /tmp/ca-cert.pem not installed: Expecting value: line 1 column 1 (char 0)
[sysadmin@controller-0 ~(keystone_admin)]$ date
ter 16 ago 2022 18:42:17 UTC
[sysadmin@controller-0 ~(keystone_admin)]$ sudo date -s "2022-08-29 15:53:32"
Password:
seg 29 ago 2022 15:53:32 UTC
[sysadmin@controller-0 ~(keystone_admin)]$ system certificate-install -m ssl_ca /tmp/ca-cert.pem
+-------------+-----------------------------------------------+
| Property | Value |
+-------------+-----------------------------------------------+
| uuid | 59c7eb3c-b3d3-42e1-bd7d-30e73f1b6aab |
| certtype | ssl_ca |
| signature | ssl_ca_10076021394652733954 |
| start_date | 2021-06-21 17:46:14+00:00 |
| expiry_date | 2032-09-07 17:46:14+00:00 |
| subject | O=Internet Widgits Pty Ltd,ST=Some-State,C=AU |
+-------------+-----------------------------------------------+
+-------------+-------------------------------------------------------------+
| Property | Value |
+-------------+-------------------------------------------------------------+
| uuid | e0feaa68-9a14-42b5-a649-a328ae2d6b7f |
| certtype | ssl_ca |
| signature | ssl_ca_568741737948341670890383595968438938602889739820 |
| start_date | 2022-08-25 17:09:48+00:00 |
| expiry_date | 2022-11-12 17:09:48+00:00 |
| subject | CN=tbrito.com,O=Internet Widgits Pty Ltd,ST=Some-State,C=AU |
+-------------+-------------------------------------------------------------+
+-------------+--------------------------------------------------------+
| Property | Value |
+-------------+--------------------------------------------------------+
| uuid | 238fcad9-c346-44db-8d3a-7831eaadcf36 |
| certtype | ssl_ca |
| signature | ssl_ca_19504410177737067966767112210409256169930823998 |
| start_date | 2022-08-16 17:25:13+00:00 |
| expiry_date | 2032-08-13 17:25:13+00:00 |
| subject | CN=starlingx |
+-------------+--------------------------------------------------------+

Test Activity
-------------
Developer Testing

Workaround
----------
None