code: private ProtoNetwork failGeneScaffolding(final ProtoNetwork pn,
              final StringBuilder bldr, String gsLocation, String errorMessage) {
          bldr.append("GENE SCAFFOLDING RESOURCE RESOLUTION FAILURE in ");
          bldr.append(gsLocation);
          bldr.append("\n\treason: ");
          bldr.append(errorMessage);
          stageWarning(bldr.toString());
  
          // could not resolve gene scaffolding resource so return original
          // proto network.
          return pn;
      }
docs: Logic to recover from a failure to resolve the gene scaffolding resource.
  
  @param pn
  @param bldr
  @param gsLocation
  @param errorMessage
  @return