[Bug] Frontend sometimes displays invalid disk size

[AleTopp]

Describe the bug
On persistent templates (like workspace-sid/vscode-python-nomarket) when you hover "Info", a Tooltip is shown with CPU/RAM/Disk information. On the template above the disk size is shown as: unavailableB.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'Experimental Workspace 1'
2. Scroll down to 'Visual Studio Code - Python (marketplace disabled)'
3. Hover 'Info'
4. See error

Expected behavior
It should display the real size of the persistent disk.
Or missing line if unavailable.

Screenshots

Desktop

• OS: All
• Browser: All
• Version All

Additional context
Inspecting the template's definition (k describe template vscode-python-nomarket -n workspace-sid), under Resources there is no Disk size specified.
As a matter of fact, when creating an instance of that template it goes in CreationLoopBackoff with reason

Warning  EnvironmentEnforcementFailed  22s (x15 over 104s)  Instance  Failed to enforce environment vscode-environment

So this issue is due to a template yaml error (since it was hand-written).
I don't know if the frontend should handle also cases like this or we have to suppose templates are correct.