style: fix style issues

api/core/workflow/nodes/knowledge_retrieval/entities.py

@@ -116,6 +116,7 @@ class MetadataFilteringCondition(BaseModel):
     logical_operator: Optional[Literal["and", "or"]] = "and"
     conditions: Optional[list[Condition]] = Field(default=None, deprecated=True)
 
+
 class MetadataFilteringComplexCondition(BaseModel):
     logical_operator: Optional[Literal["and", "or"]] = "and"
     conditions: Optional[list[Condition]] = Field(default=None, deprecated=True)

api/core/workflow/nodes/knowledge_retrieval/knowledge_retrieval_node.py

@@ -385,7 +385,6 @@ class KnowledgeRetrievalNode(LLMNode):
 
         return filters
 
-
     def _get_metadata_filter_condition(
         self, dataset_ids: list, query: str, node_data: KnowledgeRetrievalNodeData
     ) -> tuple[Optional[dict[str, list[str]]], Optional[MetadataCondition]]: