fix: update error handling in request for litellm models

[phact]

Handle request exception for litellm models.

This pull request introduces error handling for network requests and JSON parsing in the astra_assistants/util.py file. The most important changes include importing necessary exceptions and adding try-except blocks to handle potential errors.

Error handling improvements:

• src/backend/base/langflow/base/astra_assistants/util.py: Added imports for JSONDecodeError and RequestException to handle specific exceptions.
• src/backend/base/langflow/base/astra_assistants/util.py: Wrapped the network request and JSON parsing in a try-except block to handle RequestException and JSONDecodeError, ensuring the data variable is set to an empty dictionary in case of an error.

[codspeed-hq]

CodSpeed Performance Report

Merging #4536 will degrade performances by 14.38%

_{Comparing offline-startup (9099dcf) with main (f8f9b7c)}

Summary

❌ 1 regressions
✅ 14 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	main	offline-startup	Change
❌	test_successful_run_with_input_type_any	455.7 ms	532.2 ms	-14.38%