cproudlock efe2f7e6ca backups: show a kind's panels only when that asset has data ...

Every machine was getting a Part Marker Configuration panel, and only two of
the 147 known machines are part markers. A kind applies to an asset TYPE, but
whether a given asset ever carries that kind of backup is a property of the
individual machine, so type alone cannot decide what to show.

The generic renderer already handled this: a list panel is visible when it has
rows OR declares empty text. Declaring emptytext on both kinds defeated it and
forced them to render everywhere. emptytext now defaults to None on the base
class, neither bundled kind sets one, and the panel builder OMITS the key
rather than emitting null - a present-but-null 'empty' would still have kept
the panel on screen.

The DNC Info card carried empty text that could never be displayed, since
keyvalue visibility is decided purely on field count. Removed rather than left
to mislead.

A lathe now shows DNC Info and NTLARS history; 0600 and 0614 additionally show
Part Marker once something collects for them; a machine with no NTLARS data
shows no backup panels at all. The emptytext mechanism stays available for a
kind that genuinely wants to say "expected here, nothing yet".

2026-08-07 14:53:37 -04:00

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