Fix jupyter util issue

[Nic-Ma]

Fixes Project-MONAI/tutorials#230

Description

This PR enhanced the jupyter util to fix tutorial issue.

Status

Ready

Types of changes

• Non-breaking change (fix or new feature that would not break existing functionality).
• Breaking change (fix or new feature that would cause existing functionality to change).
• New tests added to cover the changes.
• Integration tests passed locally by running ./runtests.sh -f -u --net --coverage.
• Quick tests passed locally by running ./runtests.sh --quick --unittests.
• In-line docstrings updated.
• Documentation updated, tested make html command in the docs/ folder.

[Nic-Ma]

Hi @ericspod ,

I didn't reproduce the tutorial issue: Project-MONAI/tutorials#230, but seems related to this line, so I added the check in this PR.

Thanks.

[Nic-Ma]

/black

[wyli]

thanks!