Hotfix 3 SafeSchematicNode

SchematicSystem_Core/src/de/steamwar/schematicsystem/SafeSchematicNode.java

@@ -37,7 +37,7 @@ public class SafeSchematicNode {
                 return Result.ALREADY_IN_DIRECTORY;
             }
 
-            node.setParent(0);
+            node.setParent(null);
         } else {
             if(!newParent.isDir()) {
                 return Result.NOT_A_DIR;