sonar问题修改8

src/main/java/cn/quantgroup/cashloanflowboss/utils/AESUtil.java

@@ -56,7 +56,7 @@ public class AESUtil {
      */
     public static String encryptAndBase64Encode(byte[] data, String key) {
         try {
-            if (Objects.isNull(key)) {
+            if (StringUtils.isBlank(key)) {
                 return null;
             }
             byte[] raw = key.getBytes(data_encoding);