If, from the showing of the petitioner, the plaintiff would not be entitled to any relief, the court or judge must refuse to allow the writ. [C51, §2218; R60, §3806; C73, §3453; C97, §4421; C24, 27, 31, 35, 39, § 12473; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §663.6 ] Referred to in §822.1