Asset Explorer : Change message before search

[tossnet]

Pull Request

📖 Description

The first time you go to the icon or emoji search explorer, you get the message “not found”, even though you haven't done a search yet ^^.

🎫 Issues

👩‍💻 Reviewer Notes

📑 Test Plan

✅ Checklist

General

• I have added tests for my changes.
• I have tested my changes.
• I have updated the project documentation to reflect my changes.
• I have read the CONTRIBUTING documentation and followed the standards for this project.

Component-specific

• I have added a new component
• I have added Unit Tests for my new component
• I have modified an existing component
• I have validated the Unit Tests for an existing component

⏭ Next Steps

[vnbaaij]

LGTM