code: private ClassVertex addClassVertexForMissingClass(ClassDescriptor missingClassDescriptor, boolean isInterfaceEdge) {
          ClassVertex missingClassVertex = ClassVertex.createMissingClassVertex(missingClassDescriptor, isInterfaceEdge);
          missingClassVertex.setFinished(true);
          addVertexToGraph(missingClassDescriptor, missingClassVertex);
  
          AnalysisContext.currentAnalysisContext();
          AnalysisContext.reportMissingClass(missingClassDescriptor);
  
          return missingClassVertex;
      }
docs: Add a ClassVertex representing a missing class.
  
  @param missingClassDescriptor
  ClassDescriptor naming a missing class
  @param isInterfaceEdge
  @return the ClassVertex representing the missing class