[BUGFIX] Correctly handle blank string values in admin panel

Empty (in terms of PHP empty()) string values are shown as blank
strings in the info section of the admin panel. For instance "0"
is incorrectly shown as "".

Resolves: #99052
Releases: main, 11.5
Change-Id: Ic330fb1874edca8b3e640e9c5793192616583ec0
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/76543


Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Susanne Moog <look@susi.dev>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Susanne Moog <look@susi.dev>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Oliver Hader <oliver.hader@typo3.org>

typo3/sysext/adminpanel/Resources/Private/Partials/Data/TableKeyValue.html

@@ -25,7 +25,7 @@
                             <f:if condition="{adm:isArray(value: val)}"><f:variable name="typeClass" value="array" /></f:if>
                             <f:switch expression="{typeClass}">
                                 <f:case value="string">
-                                    <pre class="typo3-adminPanel-dump typo3-adminPanel-dump-{typeClass}"><f:if condition="{val}"><f:translate key="{val}" default="{val}" extensionName="adminpanel" languageKey="{languageKey}"/></f:if></pre>
+                                    <pre class="typo3-adminPanel-dump typo3-adminPanel-dump-{typeClass}"><f:if condition="{val} != ''"><f:translate key="{val}" default="{val}" extensionName="adminpanel" languageKey="{languageKey}"/></f:if></pre>
                                 </f:case>
                                 <f:case value="array">
                                     <f:render partial="Data/TableKeyValue" arguments="{data: val, languageKey: languageKey}" />