The per-app object build used `available_version:($available_version|select(.!=""))`
to omit the field when empty. But in jq, a `{key: (empty)}` makes the WHOLE
object construction emit nothing — so every app with no available update (empty
available_version) produced no object and was silently dropped from updates.json.
Only apps WITH a pending update survived; an all-up-to-date fleet showed an empty
list. (Missed in P2's sandbox test because both fixture apps had updates.)
Emit an explicit null instead: `(if $available_version=="" then null else … end)`.
Verified: an up-to-date app (trivy, local==registry digest) now emits with
available_version:null; apps with updates still carry the string.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Signed-off-by: librelad <librelad@digitalangels.vip>
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