Is it possible to add thumbnails to blog post listings independent of images in a blog post -- e.g. if there is no image in the blog post, can I add a thumbnail image?
set the 'featured image' when writing/editing your post; and use
dependent on a post image, you can check (in your template, in the loop) if the post contains an image, and then output the post thumbnail, for instance with:
details depend on your design.
You can use the