修复 GetIcon 可能出现的 FileNotFoundException  异常
修复 GetIcon 可能出现的 FileNotFoundException  异常

重启电脑的时候会提示 FileNotFoundException ，所以在这里加一个检查。
gnowxilef/Wox,gnowxilef/Wox,yozora-hitagi/Saber,derekforeman/Wox,kayone/Wox,dstiert/Wox,jondaniels/Wox,mika76/Wox,AlexCaranha/Wox,zlphoenix/Wox,gnowxilef/Wox,derekforeman/Wox,vebin/Wox,jondaniels/Wox,Launchify/Launchify,vebin/Wox,kdar/Wox,Launchify/Launchify,18098924759/Wox,JohnTheGr8/Wox,apprentice3d/Wox,medoni/Wox,JohnTheGr8/Wox,EmuxEvans/Wox,yozora-hitagi/Saber,kayone/Wox,apprentice3d/Wox,kdar/Wox,AlexCaranha/Wox,mika76/Wox,EmuxEvans/Wox,dstiert/Wox,kayone/Wox,kdar/Wox,18098924759/Wox,sanbinabu/Wox,AlexCaranha/Wox,apprentice3d/Wox,18098924759/Wox,medoni/Wox,sanbinabu/Wox,vebin/Wox,renzhn/Wox,dstiert/Wox,Megasware128/Wox,mika76/Wox,renzhn/Wox,danisein/Wox,EmuxEvans/Wox,zlphoenix/Wox,derekforeman/Wox,Megasware128/Wox,sanbinabu/Wox,danisein/Wox