JS error if an available update is marked critical (Fixes #617)

Signed-off-by: Michael Eshom <oldiesmann@oldiesmann.us>
JS error if an available update is marked critical (Fixes #619)

Signed-off-by: Michael Eshom <oldiesmann@oldiesmann.us>
JS error if an available update is marked critical (Fixes #619)

Signed-off-by: Michael Eshom <oldiesmann@oldiesmann.us>
Merge pull request #622 from Oldiesmann/release-2.1

JS error if an available update is marked critical (fixes #619)