fix:see notification when not logged in

Author: jimmy0006

src/main/java/org/poolc/api/post/controller/PostController.java

@@ -40,7 +40,7 @@ public ResponseEntity<Void> registerPost(@AuthenticationPrincipal Member member,
     @GetMapping("/post/{postId}")
     public ResponseEntity<PostResponse> viewPost(@AuthenticationPrincipal Member member, @PathVariable Long postId) {
         Post post = postService.findById(member, postId);
-        PostResponse response = PostResponse.of(post, scrapService.isScrap(member.getLoginID(),postId));
+        PostResponse response = PostResponse.of(post, (member==null)?scrapService.isScrap(member.getLoginID(),postId):false);
         return ResponseEntity.status(HttpStatus.OK).body(response);
     }