FEATURE: Add feedback on UCSB Courses Description Search when no courses meet the selection criteria

In, https://courses-qa.dokku-00.cs.ucsb.edu/coursedescriptions/search, when no courses meet the selection criteria display an informational message that states that _No courses were found_. 

<img width="1401" height="285" alt="Image" src="https://github.com/user-attachments/assets/9b6e3597-50c3-4427-bfa4-515e229e4c6d" />