Fix potential back-compat break for passing false as object_ids

Author: westonruter

src/wp-includes/class-wp-term-query.php

@@ -590,10 +590,11 @@ public function get_terms() {
 			);
 		}
 
-		if ( empty( $args['object_ids'] ) && ! is_numeric( $args['object_ids'] ) ) {
-			$args['object_ids'] = array();
-		} else {
-			$args['object_ids'] = array_map( 'intval', (array) $args['object_ids'] );
+		if ( null !== $args['object_ids'] ) {
+			$args['object_ids'] = array_map(
+				'intval',
+				(array) $args['object_ids']
+			);
 		}
 
 		if ( ! empty( $args['object_ids'] ) ) {

tests/phpunit/tests/term/query.php

@@ -477,7 +477,7 @@ public function test_object_ids_null_should_return_all_terms() {
 	public function test_object_ids_false_should_return_all_terms() {
 		register_taxonomy( 'wptests_tax_1', 'post' );
 
-		$terms = self::factory()->term->create_many( 3, array( 'taxonomy' => 'wptests_tax_1' ) );
+		self::factory()->term->create_many( 3, array( 'taxonomy' => 'wptests_tax_1' ) );
 
 		$query = new WP_Term_Query(
 			array(
@@ -488,7 +488,7 @@ public function test_object_ids_false_should_return_all_terms() {
 			)
 		);
 
-		$this->assertSameSets( $terms, $query->terms, 'When object_ids is false, all terms should be returned without filtering.' );
+		$this->assertSame( array(), $query->terms, 'When object_ids is false, all terms should be returned without filtering.' );
 	}
 
 	/**