code: def bundle_visualization_url(self, bundle_id, channel=None):
          '''Generate the path to the visualization for bundles.
  
          @param charm_id The ID of the bundle.
          @param channel Optional channel name.
          @return The url to the visualization.
          '''
          url = '{}/{}/diagram.svg'.format(self.url, _get_path(bundle_id))
          return _add_channel(url, channelf bundle_visualization_url(self, bundle_id, channel=None):
          '''Generate the path to the visualization for bundles.
  
          @param charm_id The ID of the bundle.
          @param channel Optional channel name.
          @return The url to the visualization.
          '''
          url = '{}/{}/diagram.svg'.format(self.url, _get_path(bundle_id))
          return _add_channel(url, channel)
docs: Generate the path to the visualization for bundles.
  
          @param charm_id The ID of the bundle.
          @param channel Optional channel name.
          @return The url to the visualization.