Safe Get in async validation

[victai]

The issue is same in described in #400
The safe_get function is applied to validate_dependents, but not applied to async validate_dependents.

Fix

Change line 250 in guardrails/validator_service.py from

child_value = value[child_setup.key]

to

child_value = safe_get(value, child_setup.key)

[ShreyaR]

Thanks for reporting @victai! Created a PR to fix this.

Out of curiosity, did you come across the bug while using guardrails for something? Feel free to DM on discord if you're ok sharing.

[zsimjee]

Closed because the fix was released in 0.3.0