173275 explain when there is no selected code

What does this MR do and why?

when there is no selection and user types /explain, return an error/clarification response that user should highlight some text

#461270 (comment 2296771810)

References

#461270 (comment 2293761197)

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

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Before After

How to set up and validate locally

Before the change:
The error message is sent back from LLM.

image

After the change:

If we don't receive the highlighted code we just return an error message:

Screenshot_2025-01-14_at_2.48.38_PM

Numbered steps to set up and validate the change are strongly suggested.

Edited by Tian Gao

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