fix: 🐛 don't try to access metadata build option when not provided

Author: gingerbenw

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## [Unreleased]
+
+- Fixed an issue when build metadata option is not provided (#101)
+
 ## [2.2.2] - 2025-07-03
 
 - Ensure that we correctly pass the metadata the BugSnag CLI create build command (#100)

build-reporter-plugin.js

@@ -62,9 +62,9 @@ class BugsnagBuildReporterPlugin {
     const optionalOpts = {
       autoAssignRelease: opts.build.autoAssignRelease,
       builderName: opts.build.builderName,
-      metadata: Object.entries(opts.build.metadata)
+      metadata: opts.build.metadata ? Object.entries(opts.build.metadata)
         .map(([key, value]) => `${key}=${value}`)
-        .join(','),
+        .join(',') : undefined,
       provider: opts.build.sourceControl.provider,
       repository: opts.build.sourceControl.repository,
       revision: opts.build.sourceControl.revision,