requested changes Sep 9, 2025

- Enhanced flatten_table_to_string to filter out empty error messages
- Added logic to distinguish actual errors from empty stderr output
- Prevents false error reporting when VectorCode operations succeed but have no stderr
- Provides meaningful fallback error message for truly empty error conditions
- Fixes issue where successful operations with empty stderr were reported as { "" } errors

Resolves the confusing empty error message issue in CodeCompanion integration.