test: handle undefined default_configuration

PR-URL: #30465
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

test/common/index.js

@@ -118,8 +118,9 @@ const enoughTestCpu = Array.isArray(cpus) &&
 
 const rootDir = isWindows ? 'c:\\' : '/';
 
-const buildType = process.config.target_defaults.default_configuration;
-
+const buildType = process.config.target_defaults ?
+  process.config.target_defaults.default_configuration :
+  'Release';
 
 // If env var is set then enable async_hook hooks for all tests.
 if (process.env.NODE_TEST_WITH_ASYNC_HOOKS) {