fix: Empty message in changes modal in local unit

[shreeyash07]

Summary

Add Empty message and in localunit changes modal and disable the submit button.

Addresses

• Issue(s): No issue created

Changes

• Add empty message in modal container
• Add check for the localunitChangesFormField is empty

This PR Ensures:

• No typos or grammatical errors
• No conflict markers left in the code
• No unwanted comments, temporary files, or auto-generated files
• No inclusion of secret keys or sensitive data
• No console.log statements meant for debugging
• All CI checks have passed

[changeset-bot]

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Latest commit: e0045fe

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[barshathakuri]

Fix Lint error: Unexpected newline before '}'