[ZEPPELIN-5632] zeppelin-zengine: Skip load notebook when it is damaged.

[woowahan-jaehoon]

What is this PR for?

Skip load notebook when it is damaged.

When I upgraded zeppelin 0.7 to 0.9 and I converted notebook, some notebooks are damaged. Caused damaged notebooks, zeppelin cannot start completely. But damaged notebooks can find very very hard.

What type of PR is it?

[Bug Fix]

Todos

• Nothing

What is the Jira issue?

• https://issues.apache.org/jira/browse/ZEPPELIN-5632

How should this be tested?

• Maybe create damaged notebook and start zeppelin...?

Screenshots (if appropriate)

Questions:

• Does the licenses files need update?
  • No
• Is there breaking changes for older versions?
  • No
• Does this needs documentation?
  • No

[zjffdu]

ping @woowahan-jaehoon

[zjffdu]

@woowahan-jaehoon Could you rebase it?

[woowahan-jaehoon]

@woowahan-jaehoon Could you rebase it?

I did.

[zjffdu]

Thanks @woowahan-jaehoon , could you take a look at this comment?https://github.com/apache/zeppelin/pull/4288#discussion_r793226376

[zjffdu]

@woowahan-jaehoon Can you add unit test for it?

[jongyoul]

@zjffdu I think this issue introduces more potential problems but it's not related to this PR directly. How about merging it first? It looks like a useful log. WDYT?