code: def _check_layer_count(self, layer):
          
          if layer:
              if not layer.isValid():
                  raise ImpactReport.LayerException('Layer is not valid')
              if isinstance(layer, QgsRasterLayer):
                  # can't check feature count of raster layer
                  return
              feature_count = len([f for f in layer.getFeatures()])
              if feature_count == 0:
                  raise ImpactReport.LayerException(
                      'Layer contains no features')
docs: Check for the validity of the layer.
  
          :param layer: QGIS layer
          :type layer: qgis.core.QgsVectorLayer
          :return: