“Wow,” I thought this morning when I opened the On the Town section of the Tribune. “Peter Walker looks like a man half his age.” That’s because the paper ran a photo of a Peter Walker who probably is half the age of the one performing tonight at the Empty Bottle. Not only did they run a photo of the wrong guy, they also wrote about the wrong one, previewing a well-scrubbed indie-rock dude from LA. (The listing seems to appear only in the print version of the paper.) At least they didn’t mix him up with antiseptic smooth jazz guitarist Peter White, who plays a Christmas show at the Chicago Theatre tonight.