[Usability] Better Visual Cues in Nautilus Tree View

["K. Starojitski" <k starojitski chello nl>]

When you browse Nautilus Tree View, there is no visual indication 
whether a directory has any subdirectories or not without clicking on a 
little triangle first. And then you get that really ridiculous "(Empty)" 
text if there no subs ... How can it be Empty if there are files in there?

The Tree visualization pattern is so well known that i wonder how 
Nautilus devs could overlook this one.

Removing triangle next to childless directories is the standard and 
intuitive way.