ResourceNode: Fix error toolchain after creation course - refs #4305

src/CoreBundle/Tool/ToolChain.php

@@ -181,6 +181,7 @@ class ToolChain
 
             /** @var Tool $toolEntity */
             $toolEntity = $toolRepo->findOneBy($criteria);
+            if ($toolEntity) {
                 $position = $toolList[$tool->getName()] + 1;
 
                 $courseTool = (new CTool())
@@ -190,10 +191,10 @@ class ToolChain
                     ->setVisibility($visibility)
                     ->setParent($course)
                     ->setCreator($course->getCreator())
-                ->addCourseLink($course)
-            ;
+                    ->addCourseLink($course);
                 $course->addTool($courseTool);
             }
+        }
 
         return $course;
     }