DYN-5084 Checking if the ports are empty or null

[filipeotero]

Purpose

This Pr includes the improvement for some edge cases where the Inports/Outports are wrongly colored when run at manual mode.

Declarations

Check these if you believe they are true

• The codebase is in a better state after this PR
• Is documented according to the standards
• The level of testing this PR includes is appropriate
• User facing strings, if any, are extracted into *.resx files
• All tests pass using the self-service CI.
• Snapshot of UI changes, if any.
• Changes to the API follow Semantic Versioning and are documented in the API Changes document.
• This PR modifies some build requirements and the readme is updated

Reviewers

@QilongTang @Amoursol

[reddyashish]

I have a question about the second gif in description. When the connector for watch node is removed, shouldn't the port show the red color as it is missing the value.

[filipeotero]

I have a question about the second gif in description. When the connector for watch node is removed, shouldn't the port show the red color as it is missing the value.

Hi, thanks for noticing that. This was happening because the watch node was having the same behavior of a function node.
According to the AC's of the DYN-5084, watch node shouldn't show grey bars under any circumstances.
By that, I've added a check specifically for the watch nodes.

[reddyashish]

I agree on the grey bar. I was just not clear what the red color bar on the port indicate? Missing the value or something else?

[filipeotero]

I agree on the grey bar. I was just not clear what the red color bar on the port indicate? Missing the value or something else?

Yes. It indicates when the port has no values.

[reddyashish]

LGTM with one comment.