if (cleanGraph == null || cleanGraph.isEmpty()) {
                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 {

    public boolean isEmpty() {
        return entry == null || vertices == null || vertices.isEmpty();
    }

    // ------------------------------------------------------------------------
    public boolean isEmptyEdges() {
        return isEmpty() || incidentEdges == null || incidentEdges.isEmpty();
    }
    // ------------------------------------------------------------------------
    @Override
    public String toString() {