Require DB_NAME to be set only in the new driver

Author: JanJakes

wp-includes/sqlite/class-wp-sqlite-db.php

@@ -307,6 +307,11 @@ public function db_connect( $allow_bail = true ) {
 			$pdo = $GLOBALS['@pdo'];
 		}
 		if ( defined( 'WP_SQLITE_AST_DRIVER' ) && WP_SQLITE_AST_DRIVER ) {
+			if ( null === $this->dbname || '' === $this->dbname ) {
+				$this->bail( 'The database name was not set.', 'db_connect_fail' );
+				return false;
+			}
+
 			require_once __DIR__ . '/../../wp-includes/parser/class-wp-parser-grammar.php';
 			require_once __DIR__ . '/../../wp-includes/parser/class-wp-parser.php';
 			require_once __DIR__ . '/../../wp-includes/parser/class-wp-parser-node.php';

wp-includes/sqlite/db.php

@@ -66,5 +66,5 @@
 	require_once $crosscheck_tests_file_path;
 	$GLOBALS['wpdb'] = new WP_SQLite_Crosscheck_DB( DB_NAME );
 } else {
-	$GLOBALS['wpdb'] = new WP_SQLite_DB( DB_NAME );
+	$GLOBALS['wpdb'] = new WP_SQLite_DB( defined( 'DB_NAME' ) ? DB_NAME : '' );
 }