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<?php

function hs2867_searchwp_short_circuit( $maybe ) {
	if ( ! is_admin() ) {
		return $maybe;
	}

	if ( isset( $_GET['s'] ) && 0 == strlen( trim( $_GET['s'] ) ) ) {
		return true;
	} else {
		return $maybe;
	}
}

add_filter( 'searchwp_short_circuit', 'hs2867_searchwp_short_circuit' );