fix: handle when report severity is not set (#765)

Author: RafaelGSS

lib/prepare_security.js

@@ -78,7 +78,7 @@ class SecurityReleaseIssue {
     let reportsContent = '';
     for (const report of reports.data) {
       const { id, attributes: { title }, relationships: { severity } } = report;
-      const reportLevel = severity.data.attributes.rating;
+      const reportLevel = severity ? severity.data.attributes.rating : 'TBD';
       cli.separator();
       cli.info(`Report: ${id} - ${title} (${reportLevel})`);
       const include = await cli.prompt(