fix: address CodeRabbit review comments

- Fix cache initialization inconsistency in BlockSchema.__pydantic_init_subclass__
  (use None instead of {} to match clear_schema_cache behavior)
- Change logger.error to logger.debug in stagehand blocks (not an error condition)

autogpt_platform/backend/backend/blocks/_base.py

@@ -243,7 +243,8 @@ class BlockSchema(BaseModel):
         super().__pydantic_init_subclass__(**kwargs)
 
         # Reset cached JSON schema to prevent inheriting it from parent class
-        cls.cached_jsonschema = {}
+        # Use None instead of {} because {} is truthy and would prevent regeneration
+        cls.cached_jsonschema = None
 
         credentials_fields = cls.get_credentials_fields()
 

autogpt_platform/backend/backend/blocks/stagehand/blocks.py

@@ -102,7 +102,7 @@ class StagehandRecommendedLlmModel(str, Enum):
             ), "Logic failed and open_router provider attempted to be prepended to model name! in stagehand/_config.py"
             model_name = f"{model_metadata.provider}/{model_name}"
 
-        logger.error(f"Model name: {model_name}")
+        logger.debug(f"Model name: {model_name}")
         return model_name
 
     @property