Reading the cacert field value as undefined in case it's empty

Reference: https://issues.redhat.com/browse/MTV-1653

Fix a bug in which in case of an empty/undefined cacert field value,
read it as undefined and not as 'undefined' (the result of
(string(undefined) expr)

Signed-off-by: Sharon Gratch <[email protected]>

packages/forklift-console-plugin/src/modules/Providers/utils/components/CertificateUpload/CertificateUpload.tsx

@@ -39,7 +39,7 @@ export const CertificateUpload: FC<CertificateUploadProps> = ({
       <FetchCertificateModal
         url={url}
         handleSave={(v) => onTextChange(null, v)}
-        existingCert={String(value)}
+        existingCert={value ? String(value) : undefined}
       />,
     );
   };