Default value for `background_image` is usually something like `http://localhost/blog/our-news-1/post/blog-post-title-3?enable_editor=1`, not empty, so fixing here to avoid failure loading empty covers.
Default value for `background_image` is usually something like `http://localhost/blog/our-news-1/post/blog-post-title-3?enable_editor=1`, not empty, so fixing here to avoid failure loading empty covers.

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