Firmware manager page is blank when the system is offline

[brs17]

When there is no network connection, currently an error appears error trying to connect.

When a system is offline and not connected to a network, this page should still be able to show the currently installed firmware (just not be able to check for updates).

[brs17]

I'm wondering, what errors could we get from system76-firmware that we would want to show to the user? Potentially we just handle errors where we want to change the displayed output and ignore other ones?

Example thoughts:
Error 1: No network connection
Workaround A: Ignore error, show currently installed firmware
Workaround B: Show currently installed firmware, provide some sort of message that a network connection is necessary for searching for firmware updates

Error 2: error calling the download method, which provides the changelogs
Workaround A: When the error is received, display Changelog missing or something to that extent. Would part of the Changelog missing message want to include something about how there is an error?
Workaround B: Leave changelog blank.

Other than not having a network connection (and errors gathered from that), I am not sure what value an error could provide a user.

Thoughts on how to deal with errors @WatchMkr / @mmstick / @jackpot51 ?