fix: skip processing when field value is empty in search document conditions

Author: liuruibin

apps/application/flow/step_node/search_document_node/impl/base_search_document_node.py

@@ -120,6 +120,9 @@ def handle_custom_tags(self, document_id_list: List, search_condition_list: list
                 field_value = self.workflow_manage.generate_prompt(condition['value'])
                 compare_type = condition['compare']
 
+                if field_value:
+                    continue
+
                 # 构建查询条件
                 if compare_type == 'not_contain':
                     # 反向查询:找出包含该标签的文档,然后排除
@@ -156,6 +159,9 @@ def handle_custom_tags(self, document_id_list: List, search_condition_list: list
                 field_value = self.workflow_manage.generate_prompt(condition['value'])
                 compare_type = condition['compare']
 
+                if field_value:
+                    continue
+
                 if compare_type == 'not_contain':
                     # 反向查询:找出包含该标签的文档,然后用全集减去
                     exclude_docs = set(QuerySet(DocumentTag).filter(