How do I make empty topics (caused by default post icon) disappear?

[Ogmuk]

Hi,

I'd like to use a default post icon but not for replies to threads because it simply doesn't look as neat to have the default icon above each reply. Is there a simple style change that makes the icon (and topic line) disappear or is there some option that I'm overlooking to accomplish this? I'll attach a screenshot to show what I mean.

Thanks!