docs: @Nullable
      @VisibleForTesting
      protected PolygonSymbolizer createPolygonSymbolizer(final PJsonObject styleJson) {
          if (this.allowNullSymbolizer && !styleJson.has(JSON_FILL_COLOR)) {
              return null;
          }
  
          final PolygonSymbolizer symbolizer = this.styleBuilder.createPolygonSymbolizer();
          symbolizer.setFill(createFill(styleJson));
  
          symbolizer.setStroke(createStroke(styleJson, false));
  
          return symbolizer;
      }