fix rerank model value is empty string (#7937)

api/core/rag/datasource/retrieval_service.py

@@ -146,7 +146,7 @@ class RetrievalService:
                 )
 
                 if documents:
-                    if reranking_model and retrival_method == RetrievalMethod.SEMANTIC_SEARCH.value:
+                    if reranking_model and reranking_model.get('reranking_model_name') and reranking_model.get('reranking_provider_name') and retrival_method == RetrievalMethod.SEMANTIC_SEARCH.value:
                         data_post_processor = DataPostProcessor(str(dataset.tenant_id),
                                                                 RerankMode.RERANKING_MODEL.value,
                                                                 reranking_model, None, False)
@@ -180,7 +180,7 @@ class RetrievalService:
                     top_k=top_k
                 )
                 if documents:
-                    if reranking_model and retrival_method == RetrievalMethod.FULL_TEXT_SEARCH.value:
+                    if reranking_model and reranking_model.get('reranking_model_name') and reranking_model.get('reranking_provider_name') and retrival_method == RetrievalMethod.FULL_TEXT_SEARCH.value:
                         data_post_processor = DataPostProcessor(str(dataset.tenant_id),
                                                                 RerankMode.RERANKING_MODEL.value,
                                                                 reranking_model, None, False)