Extension without version check should not display notice in ACP

Just like the extensions list in the ACP, the extension details page should not try to perform a version check if no version check information is provided. Currently a notice is displayed with two error messages and a link to Re-Check the version. (See screenshot) I believe the whole version box should be hidden in this case, because providing a version check is completely optional.

Furthermore the error code of the exception is checked, but since 3.1 the thrown exception got replaced and therefore the getCode() will always return 0 so this can be removed as well.

'S_VERSIONCHECK_STATUS'			=> $e->getCode(),