reflect: SetMapIndex should not panic on a nil map delete #8051
Description
package main
import "reflect"
func main() {
var m map[int]int
delete(m, 5)
v := reflect.ValueOf(m)
v.SetMapIndex(reflect.ValueOf(5), reflect.Value{})
}
The first two lines succeed with no panic, as they should.
The second two lines panic with "delete from nil map".
They should silently succeed instead, like the non-reflect version.