[TASK] Show reference headline only if content is available

Currently the headline "References from this item" is
always shown in the info popup, no matter if there are
ones or not.

Therefore add an additional check and render the headline
only if needed.

Change-Id: I605d7ff35001f19fa6df2972b4ffde13cca60d7e
Resolves: #41665
Releases: 6.0
Reviewed-on: http://review.typo3.org/15389
Reviewed-by: Helmut Hummel
Tested-by: Helmut Hummel

typo3/sysext/backend/Classes/Controller/ContentElement/ElementInformationController.php

@@ -286,8 +286,14 @@ class ElementInformationController {
 		$code .= $GLOBALS['LANG']->sL('LLL:EXT:lang/locallang_core.xml:labels.table') . ': ' . $GLOBALS['LANG']->sL($GLOBALS['TCA'][$this->table]['ctrl']['title']) . ' (' . $this->table . ') - UID: ' . $this->uid . '<br />';
 		$this->content .= $this->doc->section('', $code);
 		// References:
-		$this->content .= $this->doc->section($GLOBALS['LANG']->sL('LLL:EXT:lang/locallang_core.xml:show_item.php.referencesToThisItem'), $this->makeRef($this->table, $this->row['uid']));
-		$this->content .= $this->doc->section($GLOBALS['LANG']->sL('LLL:EXT:lang/locallang_core.xml:show_item.php.referencesFromThisItem'), $this->makeRefFrom($this->table, $this->row['uid']));
+		$references = $this->makeRef($this->table, $this->row['uid']);
+		if (!empty($references)) {
+			$this->content .= $this->doc->section($GLOBALS['LANG']->sL('LLL:EXT:lang/locallang_core.xml:show_item.php.referencesToThisItem'), $references);
+		}
+		$referencesFrom = $this->makeRefFrom($this->table, $this->row['uid']);
+		if (!empty($referencesFrom)) {
+			$this->content .= $this->doc->section($GLOBALS['LANG']->sL('LLL:EXT:lang/locallang_core.xml:show_item.php.referencesFromThisItem'), $referencesFrom);
+		}
 	}
 
 	/**
@@ -354,8 +360,12 @@ class ElementInformationController {
 		$this->content .= $this->doc->section('', $tableCode);
 		// References:
 		if ($this->fileObject->isIndexed()) {
-			$header = $GLOBALS['LANG']->sL('LLL:EXT:lang/locallang_core.xml:show_item.php.referencesToThisItem');
-			$this->content .= $this->doc->section($header, $this->makeRef('_FILE', $this->fileObject));
+			$references = $this->makeRef('_FILE', $this->fileObject);
+
+			if (!empty($references)) {
+				$header = $GLOBALS['LANG']->sL('LLL:EXT:lang/locallang_core.xml:show_item.php.referencesToThisItem');
+				$this->content .= $this->doc->section($header, $references);
+			}
 		}
 	}