Certificate resource lacks friendly error message in v9

[tas50]

In v8 if you passed an empty certificate resource you got back a message that helped you to realize you needed to pass in data. That's not a RPC error in v9.

V8:

cnquery> certificate{*}
! restore cache object
x certificate is missing pem data error="\"certificate\" failed: no value provided for static field \"pem\""
Query encountered errors:
failed to validate resource 'certificate': Initialized "certificate" resource without a "pem". This field is required.
certificate: no data available

V9:

cnquery> certificate{*}
rpc error: code = Unavailable desc = connection error: desc = "transport: error while dialing: dial unix /var/folders/5q/75yp5vy56_55pmjdxpcv5mfh0000gn/T/plugin915132205: connect: connection refused"
certificate: no data available

[czunker]

This should also be fixed, when #1943 is implemented.

[tas50]

We have a better error now in 9.3.3