Merge pull request #1236 from atc0005/i1235-fix-sans-collection-lengt…

…h-check

Fix SANs length check in expiration validation

internal/certs/validation-expiration.go

@@ -706,7 +706,7 @@ func (evr ExpirationValidationResult) Status() string {
 
 	// but if it is, use the first SubjectAlternateName field in its place
 	if nextCertToExpire.Subject.CommonName == "" {
-		if len(nextCertToExpire.DNSNames[0]) > 0 {
+		if len(nextCertToExpire.DNSNames) > 0 {
 			nextCertToExpireServerName = nextCertToExpire.DNSNames[0]
 		}
 	}