Error when compressing an empty folder

[smallg0at]

System.DivideByZeroException: 尝试除以零。
   在 System.Decimal.FCallDivide(Decimal& d1, Decimal& d2)
   在 Microsoft.VisualBasic.CompilerServices.Operators.DivideDecimal(IConvertible Left, IConvertible Right)
   在 Microsoft.VisualBasic.CompilerServices.Operators.DivideObject(Object Left, Object Right)
   在 CompactGUI.Compact.CalculateSaving()
   在 CompactGUI.Compact.ProgressTimer_Tick(Object sender, EventArgs e)

Okay, it's weird but need a little fix.
(Sorry for the chinese error message)
1.4.0_rc2

[Iridium-IO]

why are you compressing an empty folder? It's a good bug to pick up on to be sure, helps tidy up the code, but why?

[smallg0at]

no why.
(actually because I hate to see the ugly error dialog)

[wopian]

@ImminentFate systematically going through every folder - some root folders in one of my external steam folders were empty which I didn't know until hitting this error multiple times.

[Iridium-IO]

should be an easy enough try catch() to sort that out :) I'll do it after I finish off the localisation stuff

[smallg0at]

tested a little. the error will occur when:
-no file in folder or its full size = 0