minor #4289 Remove unused private methods (fabpot)

This PR was merged into the 3.x branch.

Discussion
----------

Remove unused private methods

Commits
-------

28dc912c Remove unused private methods

src/Node/ModuleNode.php

@@ -418,14 +418,6 @@ final class ModuleNode extends Node
                     continue;
                 }
 
-                if ($node instanceof TextNode && ctype_space($node->getAttribute('data'))) {
-                    continue;
-                }
-
-                if ($node instanceof BlockReferenceNode) {
-                    continue;
-                }
-
                 $traitable = false;
                 break;
             }
@@ -494,19 +486,4 @@ final class ModuleNode extends Node
             throw new \LogicException('Trait templates can only be constant nodes.');
         }
     }
-
-    private function hasNodeOutputNodes(Node $node): bool
-    {
-        if ($node instanceof NodeOutputInterface) {
-            return true;
-        }
-
-        foreach ($node as $child) {
-            if ($this->hasNodeOutputNodes($child)) {
-                return true;
-            }
-        }
-
-        return false;
-    }
 }