[BUG] pkg.uptodate reports success when refresh=True but package database check fails

Description
As title

Setup
Debian-10 master/minion set
Salt: 3003

update.sls:

update:
  pkg.uptodate:
    - refresh: True

Steps to Reproduce the behavior
Take master offline or block external access.
salt '*' state.apply update

Expected behavior
Result will show "False"
Optional - Comment may report failure to update packages

Versions Report
I'm not on that machine at present.
Fresh install of Salt 3003, but reproducible elsewhere

Additional context
pkg.uptodate returns only True or False.

The reported Result is True with comment System is already up-to-date
This is fine when refresh is False, but when user has explicitly set refresh to True, it's a reasonable assumption that the failure to refresh will be somehow reported.
See e.g. QubesOS/qubes-issues#6585

Start with the pkg.uptodate state entry point and reproduce the report using update.sls with refresh: True while the master or external access is unavailable. Compare the returned result and comment with the expected failure behavior; done means a failed database refresh is reported instead of success with "System is already up-to-date".