comark/tabs/empty-tabs · Give every ::tabs a tab

A ::tabs with no :::tabs-item inside, or a ::code-group with no code blocks, has nothing to show, so the page gets an empty box.

Incorrect

::tabs
::

lint-comark example.mdexample.md:1:1 comark/tabs/empty-tabs::tabs 1 has no tabs.Put :::tabs-item{label="..."} blocks inside it, or remove it.✖ 1 problem

Correct

::tabs
:::tabs-item{label="North pond"}
14 ducks.
:::
::

lint-comark example.md✔ No problems