return null;
            }

            ClasspathContainer cpc = new ClasspathContainer(scope);
            if (cleanGraph.isEmptyEdges()) {
                // single entry in the classpath, populated from itself
                ArtifactMetadata amd = cleanGraph.getEntry().getMd();
                cpc.add(amd);
            } else {
                ClasspathGraphVisitor v = new ClasspathGraphVisitor(cleanGraph, cpc);