[BUGFIX] Show descriptionColumn in PageLayoutView only if not empty

Check if there is actually content provided to build the footer of
content elements in the page module.

Resolves: #84602
Releases: master, 8.7
Change-Id: Ic2be8eed03b7ed06bc6f048f5e56854e5155615c
Reviewed-on: https://review.typo3.org/56550


Reviewed-by: Mathias Schreiber <mathias.schreiber@typo3.com>
Tested-by: Mathias Schreiber <mathias.schreiber@typo3.com>
Reviewed-by: Daniel Goerz <ervaude@gmail.com>
Tested-by: Daniel Goerz <ervaude@gmail.com>
Reviewed-by: Tymoteusz Motylewski <t.motylewski@gmail.com>
Tested-by: Tymoteusz Motylewski <t.motylewski@gmail.com>