Presence of table header is not consistent w.r.t. empty data

[zegkljan]

Steps to reproduce

When the table has no data at the beginning, no header is displayed. However, if the table had some data but these later disappeared (emptied), the header is displayed.

Which browser?

Google Chrome Version 75.0.3770.100 (Official Build) (64-bit) on Arch Linux

What is expected?

First and foremost, the behaviour should be consistent. That means that when there is no data, the header should either be always present (which I think is the more correct behaviour) or never present, regardless of when did the data get empty.
Ideally, I should be able to choose how to behave in case there is no data.

Reproduction Link

Using the unmodified sample for search and empty state from the table documentation page: https://codesandbox.io/s/p7n7xjjr3j?module=App.vue - when the search produces no results, the headers are visible, but if I comment out the single line in the created() method (i.e. the searched field is and remains empty from the very start) the header is not displayed.