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fix the bug reflect on zero Value - #69
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fix the bug ：reflect: call of reflect.Value.Type on zero Value
if the slice is nil， or len==0， will be panic.
the case:
type Foo struct{
Bar[]int
}
func TestGoFunk(t *testing.T) {
Log.InitLog()
foo := []Foo{}
bars := funk.Get(foo, "Bar") //panic !!
fmt.Print(bars)
}
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fix the bug ：reflect: call of reflect.Value.Type on zero Value
if the slice is nil， or len==0， will be panic.
the case: