Added empty Post constructor

py34/post.py

@@ -20,6 +20,10 @@ class Post:
         self._image:        ImageFile | None = None
 
 
+    def empty(id: int) -> "Post":
+        return Post(id, 0, "00", [], b"")
+
+
     def get_thumbnail(self) -> ImageFile:
         if self._thumbnail is not None:
             return self._thumbnail