[BUGFIX] EXT:info_pagetsconfig Optimized view on page 0

If there are no pages containing Page TSconfig settings in the page
configuration an info FlashMessage is shown instead of an empty table.

Resolves: #78509
Releases: master
Change-Id: I4a5cda38746187a1147e5500e77b516cb9a85fd6
Reviewed-on: https://review.typo3.org/51043


Reviewed-by: Josef Glatz <josef.glatz@typo3.org>
Tested-by: Josef Glatz <josef.glatz@typo3.org>
Tested-by: Riccardo De Contardi <erredeco@gmail.com>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>