added nglPath::Copy error handling
added nglPath::Copy error handling

UIKit0/nui3,UIKit0/nui3,libnui/nui3,libnui/nui3,libnui/nui3,UIKit0/nui3,UIKit0/nui3,libnui/nui3,libnui/nui3,UIKit0/nui3,UIKit0/nui3,libnui/nui3,UIKit0/nui3