诊断依据后台维护：加载词库进行非null判断

graphdb/src/main/java/org/diagbot/service/impl/KnowledgeServiceImpl.java

@@ -1569,7 +1569,7 @@ public class    KnowledgeServiceImpl implements KnowledgeService {
         Statement st = null;
         ResultSet rs = null;
         try {
-            String tongName, type,  isConcept,stand;
+            String tongName, type,  isConcept,stand = "";
             String sql = "SELECT name, type_id,is_concept,IF(is_concept=1,a.name,(select lib_name from kl_concept b where b.id = a.concept_id) ) lib_name \n" +
                     "from kl_library_info a where  a.is_deleted = 'N'\n" +
                     "and type_id in (1,5,12,13,14,16,17,18,35,70)";
@@ -1581,7 +1581,10 @@ public class    KnowledgeServiceImpl implements KnowledgeService {
                 tongName = CryptUtil.decrypt_char(tongName);
                 type = rs.getString(2);
                 isConcept = rs.getString(3);
-                stand = CryptUtil.decrypt_char(rs.getString(4));
+                if(StringUtils.isNotEmpty(rs.getString(4))){
+                    stand = CryptUtil.decrypt_char(rs.getString(4));
+                }
+
                 detail = new HashMap<>();
                 detail.put("isConcept",isConcept);
                 detail.put("stand",stand);