Upgraded fetch logic

[technologic-technologic]

More info below

[github-actions]

PR Summary

WHAT Changed

• 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.

WHY It Matters

• 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.

RISKS

• Potential performance impact due to fetching all products when the paginated result is empty, especially if the dataset is large.
• Increased complexity in the method may introduce bugs if not properly tested.

TESTS to Add

• Unit tests to verify the new logic for handling empty paginated results.
• Tests to ensure that the correct subset of products is returned when the fallback logic is triggered.
• Performance tests to assess the impact of fetching all products on larger datasets.

BREAKING CHANGES

• No breaking changes introduced.

Changed File Paths

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