Backport of command/meta_backend: Allow the remote backend to have no workspaces [again] into v1.1 #30165
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Backport
This PR is auto-generated from #30142 to be assessed for backporting due to the inclusion of the label 1.1-backport.
The below text is copied from the body of the original PR.
Closes #30129
A regression introduced in d72a413 (#29945)
The comment explains, but TLDR: The remote backend actually depended on being able to write it's backend state even though an 'error' occurred (no workspaces). This is expected behavior for the remote backend:
With the improvements made in the changes mentioned above, an error now means that the backend config should not be written to disk......except in this particular situation, sadly.
There are no tests for this, I know; we don't really have any sort of test harness for initializing this backend (all backend tests like this just use the local backend).