fix: CURL empty command error msg fix

[PiyushPushkar02]

Description

• Changed the error message returned in case of empty input from the user for CURL import

Fixes #12008

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

• Manual

Checklist:

Dev activity

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [ ] New and existing unit tests pass locally with my changes
• [ ] PR is being merged under a feature flag

QA activity:

• [ ] Test plan has been approved by relevant developers
• [ ] Test plan has been peer reviewed by QA
• [ ] Cypress test cases have been added and approved by either SDET or manual QA
• [ ] Organized project review call with relevant stakeholders after Round 1/2 of QA
• [ ] Added Test Plan Approved label after reveiwing all Cypress test

[PiyushPushkar02]

Hi @PiyushPushkar02 , can you please add a JUnit TC for this in CurImporterServiceTests.java if possible ?

Done @sumitsum

[PiyushPushkar02]

/ok-to-test

[github-actions[bot]]

Tests running at: https://github.com/appsmithorg/appsmith/actions/runs/4935582637. Workflow: Appsmith External Integration Test Workflow. Commit: ``. PR: 23119. Perf tests will be available at https://app.appsmith.com/app/performance-infra-dashboard/pr-details-638dd7cd2913ba43778b915e?pr=23119&runId=4935582637_1

[github-actions[bot]]

Workflow run: https://github.com/appsmithorg/appsmith/actions/runs/4935582637. Commit: ``. The following are new failures, please fix them before merging the PR:

1. cypress/integration/Regression_TestSuite/ClientSideTests/Widgets/Sliders/RangeSlider_spec.ts

To know the list of identified flaky tests - Refer here

[github-actions[bot]]

Workflow run: https://github.com/appsmithorg/appsmith/actions/runs/4935582637. Commit: ``. All cypress tests have passed 🎉

[github-actions[bot]]

Workflow run: https://github.com/appsmithorg/appsmith/actions/runs/4935582637. Commit: ``. All cypress tests have passed 🎉

[github-actions[bot]]

Workflow run: https://github.com/appsmithorg/appsmith/actions/runs/4935582637. Commit: ``. All cypress tests have passed 🎉

[PiyushPushkar02]

/build-deploy-preview

[github-actions[bot]]

Deploying Your Preview: https://github.com/appsmithorg/appsmith/actions/runs/4944585060. Workflow: On demand build Docker image and deploy preview. skip-tests: . env: . PR: 23119. recreate: .

[PiyushPushkar02]

/build-deploy-preview

[github-actions[bot]]

Deploying Your Preview: https://github.com/appsmithorg/appsmith/actions/runs/4945106978. Workflow: On demand build Docker image and deploy preview. skip-tests: . env: . PR: 23119. recreate: .

[github-actions[bot]]

Deploy-Preview-URL: https://ce-23119.dp.appsmith.com