🐛 fix(endpoints.py): add try-except block when processing tweaks to catch and log exceptions

🐛 fix(process.py): fix KeyError when processing tweaks on graph_data with missing "data" key
The try-except block added in endpoints.py catches any exceptions that occur when processing tweaks and logs them to the logger. This helps with debugging and identifying issues with the processing of tweaks. In process.py, a KeyError was fixed by checking if the "data" key exists in the graph_data dictionary before accessing the "nodes" key.