BugFix: Get_Agents_Project_id throwing 500 internal Server Error

[Arkajit-Datta]

Description

This is a bugfix for the API endpoint - get_agents_by_project_id in controllers>agents.py
The endpoint was throwing 500 internal server error.

Related Issues

Solution and Design

• The issue appeared whenever there wasn't any agent under a specific project id
• The returning list was not initialized, hence it was throwing a 'reference before assignment' error.

Test Plan

Query the API for various project ids, specifically the ones having no active agents.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Docs update

Checklist

• My pull request is atomic and focuses on a single change.
• I have read the contributing guide and my code conforms to the guidelines.
• I have documented my changes clearly and comprehensively.
• I have added the required tests.