* Skip empty cells on the narrow data table secondary line
In narrow mode the main column renders every other visible column on a
secondary line, but the dot separator was inserted based on the column
index instead of whether the cell rendered anything. A row whose extra
columns are all empty showed a secondary line consisting only of dots,
and an empty column between two filled ones produced a double dot.
Filter empty cells out before joining, and return `nothing` instead of
`html`${nothing}`` for missing timestamps so those cells are detectably
empty too.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
* Extract / clarify data table column visibility
* Fix unbound method and add all-empty secondary line test
Co-authored-by: timmo001 <28114703+timmo001@users.noreply.github.com>
* Fix prettier formatting in ha-data-table test
Co-authored-by: timmo001 <28114703+timmo001@users.noreply.github.com>
---------
Co-authored-by: marcinbauer85 <marcinbauer85@gmail.com>
Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
