status shows as unrevoked even if status list can't be retrieved

[jchartrand]

Describe the bug
If the status list for a given credential can't be retrieved during verification (for any reason including that the list is no longer maintained by the issuer), then the credential shows as Invalid in the LCW, but the revocation status shows as: "Has not been revoked by issuer." even though we can't confirm the status either way.

See the screenshot below for an example of how it currently (and incorrectly) shows.

To Reproduce
Steps to reproduce the behavior:
1.Issue a credential with a status
2.Make it so the status list associated with the status entry is no longer available at its url
3. open the credential in the LCW

Expected behavior
Rather than saying "Has not been revoked by issuer." it should instead say, "Revocation status could not be checked."

Screenshots
This is how it currently (and incorrectly) shows:

Additional context

VerifierPlus has the same problem, which is described by this issue: digitalcredentials/web-verifier-plus#138
We want both the LCW and V+ to show the same messaging.