Resolve ruff issues

Author: gabor-openai

src/guardrails/agents.py

@@ -461,7 +461,6 @@ def _resolve_agent_instructions(instructions: str | None, prompt: Any | None) ->
     Returns:
         A string containing the agent instructions when available, otherwise ``None``.
     """
-
     if instructions is not None:
         return instructions
 

tests/unit/test_agents.py

@@ -16,8 +16,8 @@
 guardrails_pkg.__path__ = [str(Path(__file__).resolve().parents[2] / "src" / "guardrails")]
 sys.modules.setdefault("guardrails", guardrails_pkg)
 
-from guardrails._openai_utils import SAFETY_IDENTIFIER_HEADER, SAFETY_IDENTIFIER_VALUE
-from guardrails.types import GuardrailResult
+from guardrails._openai_utils import SAFETY_IDENTIFIER_HEADER, SAFETY_IDENTIFIER_VALUE  # noqa: E402
+from guardrails.types import GuardrailResult  # noqa: E402
 
 # ---------------------------------------------------------------------------
 # Stub agents SDK module so guardrails.agents can import required symbols.