Restore correct code: A module decide if standard code is used or not

after running by a return code that is an int 
0=execute standard code, 1=disable standard code

To return a string to show or an array or error codes, this must be done
by setting
$actionclassinstance->results
or
$actionclassinstance->resprints

htdocs/core/class/commonobject.class.php

@@ -2482,7 +2482,7 @@ abstract class CommonObject
         $parameters=array();
         $reshook=$hookmanager->executeHooks('showLinkedObjectBlock',$parameters,$this,$action);    // Note that $action and $object may have been modified by hook
 
-        if (empty($hookmanager->resPrint))
+        if (empty($reshook))
         {
         	$num = count($this->linkedObjects);
 

htdocs/core/class/hookmanager.class.php

@@ -41,8 +41,8 @@ class HookManager
 
 	// Array result
 	var $resArray=array();
-	// Printable result (int, string)
-	var $resPrint;
+	// Printable result
+	var $resPrint='';
 
 	/**
 	 * Constructor