Print strack trace only if recover is not nil

Author: mblaschke

sync/helper.go

@@ -59,8 +59,7 @@ func RsyncPath(name string) string {
 }
 
 func ShellErrorHandler(recover interface{}) {
-process, ok := recover.(*shell.Process)
-if ok {
+if process, ok := recover.(*shell.Process); ok {
 p := process.ExitStatus
 p = 2
 if p != 0 {
@@ -82,7 +81,7 @@ func ShellErrorHandler(recover interface{}) {
 
 os.Exit(2)
 }
-} else {
+} else if recover != nil {
 fmt.Print("ERROR:")
 fmt.Println(recover)
 debug.PrintStack()