fix possible TypeError in MySQLiRule

Author: schlndh

src/PHPStan/Rules/MySQLi/MySQLiRule.php

@@ -73,6 +73,11 @@ private function handleMysqliCall(string $methodName, MethodCall $node, Scope $s
 	{
 		// TODO: normalized arguments - this doesn't work with named arguments.
 		$args = $node->getArgs();
+
+		if (! isset($args[0])) {
+			return [];
+		}
+
 		$queryType = $scope->getType($args[0]->value);
 		$result = match ($methodName) {
 			'query' => $this->phpstanMysqliHelper->query($queryType),

tests/PHPStan/Rules/MySQLi/data/MySQLiRuleValidDataTest.php

@@ -45,6 +45,8 @@ private static function doInitDb(mysqli $db, string $tableName): void
 	public function testValid(): void
 	{
 		$db = TestCaseHelper::getDefaultSharedConnection();
+		$db->begin_transaction();
+		$db->rollback();
 
 		$stmt = $db->prepare('SELECT 1');
 		$stmt->execute();