Yeah, it's just checking for empty lines. Originally I was doing more crazy checking in there like looking for leading spaces, trailing spaces, etc, but decided to just trust the operator.

Thanks for the tip re: block vs expression. In this case, I am not too worried since this is create flow and that's bound to be some small 0.001% of pageviews. The net gain wouldn't really make it worth rewriting. But I've learned something for the future! :)