func (lambda *Lambda) NoError() bool {
	return lambda.Errors == nil || len(lambda.Errors) == 0
}
NoError checks if any error occured before
package lambda
import (
	"fmt"
	"strings"
)
func (lambda *Lambda) Dummy() *Lambda {
	l, ch := lambda.clone()
	go func() {
		for item := range lambda.val {
			ch <- item
		}
	}()
	return l
}
func (lambda *Lambda) MustNoError() *Lambda {
	if !lambda.NoError() {
		panic(lambda.Errors)
	}
	return lambda.Dummy()
}