修复不能上传动态图片的问题

src/main/java/cn/meteor/beyondclouds/modules/post/api/PostApi.java

@@ -56,7 +56,7 @@ public class PostApi {
         //对图片进行类型转换
         //对图片进行类型转换
         Post post = new Post();
         Post post = new Post();
         BeanUtils.copyProperties(postForm, post);
         BeanUtils.copyProperties(postForm, post);
-        if (null != post.getPictures()){
+        if (!StringUtils.isEmpty(postForm.getPictures())){
             post.setPictures(postForm.getPictures()
             post.setPictures(postForm.getPictures()
                     .stream().map(String::valueOf)
                     .stream().map(String::valueOf)
                     .collect(Collectors.joining(",")));
                     .collect(Collectors.joining(",")));