display SSL error from exception (bnc#882573)

- hide details section if there are no details actually
changes
Merge pull request #108 from yast/ssl_error_details_fix

SSL error details fix
fix version provided for the extension list
added changes
Merge pull request #107 from yast/master-mc-fix-product-version

fix version provided for the extension list
use the new connect SSL API

(see https://github.com/SUSE/connect/pull/115)