Add a warning when source query parameter contains invalid values

[manojks1999]

Fixes

Fixes #3945 by @obulat

Description

Added warning for invalid sources from input.

Testing instructions

Checklist

• My pull request has a descriptive title (not a vague title likeUpdate index.md).
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• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.
• [N/A] I ran the DAG documentation generator (if applicable).

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[sarayourfriend]

The code as is will not work.

Can you add testing instructions to the PR description, @manojks1999? A small unit test could also help verify that the code works as intended, and would have caught the existing bug.

[sarayourfriend]

Suggested change

	if original_len > len(sources):
	if original_len > len(valid_sources):

[zackkrida]

Hi @manojks1999 I will draft this PR for you until you've had a chance to address feedback from reviewers. Thank you for the PR!

[obulat]

@manojks1999, thank you for your work on this PR!
I updated the PR to add the required changes and added a test. It's ready for re-review, @sarayourfriend .

[sarayourfriend]

LGTM, thanks for updating the PR, Olga, and thanks for starting it, @manojks1999.