code: protected function loadDummyBundle($name)
      {
          if (!isset($this->_dummyBundles[$name])) {
              $this->_dummyBundles[$name] = $this->loadBundle($name, [
                  'sourcePath' => null,
                  'js' => [],
                  'css' => [],
                  'depends' => [],
              ]);
          }
  
          return $this->_dummyBundles[$name];
      }
docs: Loads dummy bundle by name.
  
  @param string $name
  @return AssetBundle