bug fixed

wisenergy-service/src/main/java/cn/wisenergy/service/app/impl/UploadServiceImpl.java

@@ -269,7 +269,7 @@ public class UploadServiceImpl implements UploadService {
      */
     private Path fileStorageLocation; // 文件在本地存储的地址
 
-    public UploadServiceImpl(@Value("${file.upload.path}") String path) {
+    public UploadServiceImpl(@Value("${file.upload.path:#{null}}") String path) {
         this.fileStorageLocation = Paths.get(path).toAbsolutePath().normalize();
         try {
             Files.createDirectories(this.fileStorageLocation);