Upgraded fetch logic

[technologic-technologic]

• Enhanced the InventoryServiceImpl class to handle cases where the paginated query returns an empty result set.
• Added logic to fetch all products matching the filter if the initial paginated result is empty, and return a sublist based on the page size.
• Improves user experience by ensuring that even if a paginated request returns no results, relevant products can still be retrieved and displayed.
• Prevents situations where users see no results when there are actually products available that match the filter criteria.

More info below

[github-actions]

Pull Request Summary

WHAT Changed

• Added logic to handle cases where the initial query returns an empty page of products.
• If the page is empty but there are products available, it retrieves all matching products and returns a sublist based on the page size.

WHY It Matters

• Improves user experience by ensuring that users can still see relevant products even when the paginated query returns no results.
• Enhances the functionality of the inventory management system by providing fallback behavior for empty pages.

RISKS

• Potential performance impact due to additional queries to the database if the initial page is empty.
• Risk of returning incorrect pagination information if the fallback logic is not properly handled.

TESTS to Add

• Unit tests to verify the new logic for handling empty pages.
• Integration tests to ensure that the fallback mechanism works correctly with various page sizes and product counts.

BREAKING CHANGES

• No breaking changes introduced.

Changed File Paths

• src/main/java/com/encorazone/inventory_manager/service/InventoryServiceImpl.java