As a user I want to publish my pixieapp, but when running it just returned "data is loading"

[maychu]

1. I created my pixieapp, and published successfully.
2. When going to pixieapp: it just returned "Loading your data. Please wait". Logging does not provide useful information.

David looked at it and found the ! caused the problem.

Expected behavior

Actual behavior

Steps to reproduce the behavior

HERE's the Notebook (saved as a .py, renamed to .txt)
pixieapp-github-publish-run-err.txt

[maychu]

notebook is: pixieapp-github-publish-run-err , on my staging dsx

You can find the notebook in box: https://ibm.box.com/s/kimw2toyajnearlj5til6ve42gjmwdo2