Support option if author.name is not set then don't display avatar and "By <name>" line

I added a small change to check if the author.name is set. If not then the avatar pic and "By <name> lines are not displayed. This gives a simple way to hide the avatar and "By <name>" line. I basically did this as on my blog I am the only one posting I find it a bit unnecessary to include the author info in each post.

Hope you find this useful.