show error message and disable buttons if backup target is not available #771
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What this PR does / why we need it
Since bbi table is added in backing image page in previous PR.
We should show
backup target URL is empty
error message in backup, backingImage or systemBackups pages and disable related buttons.Issue
longhorn/longhorn#7541
Test Result
Empty backuptarget
show_error_if_backuptarget_missing.mov
Availalbe backuptarget
backuptarget_enabled.mov
Additional documentation or context
If user input non-available backuptarget, couldn't connect it or typo.
The error msg too long to read. Maybe we can simple it to one sentence like
backup target is not available
cc @ChanYiLin