Fix client revocation 
Fix client revocation 

A client revocation would make crl.pem unreadable and thus blocking any other client to connect.

Fixes https://github.com/Angristan/OpenVPN-install/pull/47, https://github.com/Angristan/OpenVPN-install/issues/25 and https://github.com/Angristan/OpenVPN-install/issues/49.
Angristan/OpenVPN-install