exercise 2 of https://colab.research.google.com/github/ray-project/tutorial/blob/master/exercises/colab01-03.ipynb: web scrapping returns empty data frame

[alirezanobakht13]

in exercise 2 of https://colab.research.google.com/github/ray-project/tutorial/blob/master/exercises/colab01-03.ipynb, in Application: Parallel web-scraping, the data frame is empty after running cells: I think some changes are needed based on GitHub frontEnd changes.