fix crash when a file doesn't exit in static folder.
fix crash when a file doesn't exit in static folder.

my bad, previous patch was buggy
yunkai/ChicagoBoss,solatis/ChicagoBoss,solatis/ChicagoBoss,powermedia/ChicagoBoss,aherranz/ChicagoBoss,uselessd/ChicagoBoss,frkarl/ChicagoBoss,danikp/ChicagoBoss,frkarl/ChicagoBoss,synlay/ChicagoBoss,aherranz/ChicagoBoss,uselessd/ChicagoBoss,lamptt/ChicagoBoss,lamptt/ChicagoBoss,powermedia/ChicagoBoss,7i11/ChicagoBoss,danikp/ChicagoBoss,ChicagoBoss/ChicagoBoss,7i11/ChicagoBoss,yunkai/ChicagoBoss,ChicagoBoss/ChicagoBoss,synlay/ChicagoBoss