update location field in metric value class

[rachel-labri-tipton]

Pull Request

Description

In order to get a value for Daily Latest MAE All GSPs from the metric_value table in the database, the MetricValue class in the datamodel needed the location field to be updated with None instead of ....

This has been updated.

Fixes # => As this is a quick fix, I didn't make an issue for this.

How Has This Been Tested?

I ran the Docker tests and they passed.

• [x] Yes

Checklist:

• [x] My code follows OCF's coding style guidelines
• [x] I have performed a self-review of my own code
• [ ] I have made corresponding changes to the documentation
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have checked my code and corrected any misspellings