fix test

enrollments-events/app/events/issue_cert.py

@@ -43,7 +43,7 @@ def lambda_handler(event: EventBridgeEvent, context: LambdaContext) -> bool:
     # Certificate may have no expiration
     cert_expires_at = (
         completed_at + timedelta(days=int(cert['exp_interval']))
-        if 'exp_interval' in cert
+        if cert.get('exp_interval', 0) > 0
         else None
     )