cleanup #list_of
cleanup #list_of

* remove unnecessary local variable `to_return`
* assign if statement to result
* fix whitespace

haml/haml,macressler/haml,stanhu/haml,keithpitty/haml,haml/haml,nazar-pc/haml,haml/haml,keithpitty/haml,dg1dd1ngs/haml,sideci-sample/sideci-sample-haml,macressler/haml,tangposmarvin/haml,stanhu/haml,dg1dd1ngs/haml,haml/haml,nazar-pc/haml,tangposmarvin/haml