[BUG] Command line variable ignored when supplied to command in server

[alexbethea22]

Describe the bug

When I run this command against the cli method in the server:

dbt run --vars '{period_start_date: '2019-04-01', period: 'day'}' -m buildings

the command line variables are ignored. Instead I would expect the command line variables to be present in the context.

Note: partial parsing is enabled in this environment

Steps To Reproduce

tbd

The output of dbt --version:

O.15.2

[iahelr]

Hi, this also happens when we run a job and pass to it variables options as part of the dbt run command.