Incorrect error message when validating job

[sethvargo]

Nomad version

Nomad v0.5.0-dev ('d8e2a33802e1ef2adc3f74d0645e550177157115')

Issue

Given an invalid job file which omits the job name, the error message is not valid.

Reproduction steps

1. Run the job file below (nomad validate example.nomad works too)

2. The error will be:

   Error getting job struct: error parsing 'job': only one 'job' block allowed
   

3. The actual error is that I didn't specify a name for the job

Job file (if appropriate)

job {}

[github-actions]

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