[BUGFIX] Only show CSH icon when EXT:context_help is loaded

When having EXT:context_help uninstalled an empty button is shown in
Web => Info => PageTSconfig, because the text could not be fetched.

Solution: Only show the button if there is a text inside.

Resolves: #76376
Releases: master, 7.6
Change-Id: I06b14a7f6166ec1e9bca412b3b3404762fc7d7b6
Reviewed-on: https://review.typo3.org/48404


Reviewed-by: Gianluigi Martino <gmartino27@gmail.com>
Tested-by: Gianluigi Martino <gmartino27@gmail.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>