better dbt error messages

Describe the bug

dbt threw an error, after our latest merge into the repository. We later realized that, it was because of missing quotes in cluster by config array. But, to identify this error, we had to remove models in trial and error to isolate the error. We would like more descriptive error message for easier isolation and fix.

Running with dbt=0.16.1
Encountered an error:
cannot pickle '_thread.RLock' object

Steps To Reproduce

1. Using version 0.16.1
2. In the model config give the cluster by config as below {{
   config( cluster_by = [column1, column2, column3] ) }}
3. Run any model and you will get below dbt error.

Expected behavior

We wanted to error message to clearly say, where the issue was.

Screenshots and log output

Running with dbt=0.16.1
Encountered an error:
cannot pickle '_thread.RLock' object

System information

Which database are you using dbt with?

• Snowflake

The output of dbt --version:

0.16.1

**The operating system you’re using: ** windows

The output of python --version: 3.8.2

Additional context

Add any other context about the problem here.

[rameesraja]

@jtcohen6 : yes it was a mistakes by one of our developers. But the error message was not descriptive enough and that’s why this issue is raised for.

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