fix: ChatPromptBuilder from_dict if template is None

[faymarie]

Related Issues

When initialisizing ChatPromptBuilder component from_dict with value {"template": None},
we receive 'NoneType' object is not iterable.

Proposed Changes:

Fix from_dict method.

How did you test it?

Unit test

Notes for the reviewer

Checklist

• I have read the contributors guidelines and the code of conduct
• I have updated the related issue with new insights and changes
• I added unit tests and updated the docstrings
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test:.
• I documented my code
• I ran pre-commit hooks and fixed any issue

[coveralls]

Pull Request Test Coverage Report for Build 10265959872

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.001%) to 90.143%

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Totals
Change from base Build 10247553761:	0.001%
Covered Lines:	6914
Relevant Lines:	7670

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💛 - Coveralls

[julian-risch]

Hi @faymarie thanks for bringing this issue to our attention and for opening a pull request at the same time! 👍
I suggest that we keep template set to None instead of replacing it with an empty list if the dict contains None. Something like:

        template = init_parameters.get("template")
        if template:
            init_parameters["template"] = [ChatMessage.from_dict(d) for d in template]
        else:
            init_parameters["template"] = None

or actually the following should be sufficient

        template = init_parameters.get("template")
        if template:
            init_parameters["template"] = [ChatMessage.from_dict(d) for d in template]

In that case the test case would also need to be adjusted to check for assert component.template == None
What do you think? If we can merge the PR today, it will make it into the 2.4.0 release.

[faymarie]

        template = init_parameters.get("template")
        if template:
            init_parameters["template"] = [ChatMessage.from_dict(d) for d in template]

You are right. Better to keep it None! Pushed the change. We would be happy to have it in the upcoming release already! @julian-risch

[julian-risch]

LGTM! 👍