code: def load_install_json(self, filename=None):
          
          if filename is None:
              filename = 'install.json'
  
          file_fqpn = os.path.join(self.app_path, filename)
          install_json = None
          if os.path.isfile(file_fqpn):
              try:
                  with open(file_fqpn, 'r') as fh:
                      install_json = json.load(fh)
              except ValueError as e:
                  self.handle_error('Failed to load "{}" file ({}).'.format(file_fqpn, e))
          else:
              self.handle_error('File "{}" could not be found.'.format(file_fqpn))
          return install_json
docs: Return install.json data.
  
          Args:
              filename (str, optional): Defaults to None. The install.json filename (for bundled
                  Apps).
  
          Returns:
              dict: The contents of the install.json file.