Handle error in certificate creation (#137)
Handle error in certificate creation (#137)

In case certificate creation/saving the certificate does not
succeed fail with error message.
sbender9/signalk-server-node,webmasterkai/signalk-server-node,SignalK/signalk-server-node,webmasterkai/signalk-server-node,SignalK/signalk-server-node,SignalK/signalk-server-node,sbender9/signalk-server-node,sbender9/signalk-server-node,SignalK/signalk-server-node,webmasterkai/signalk-server-node