return null if plevel values < 0

[rachel-labri-tipton]

Pull Request

Description

Added a condition to the Tooltip code to not show plevel values when plevel values are < 0. This might not happen often but occasionally a negative number might make its way through the API for mysterious and unknown reasons.

Fixes #379

How Has This Been Tested?

Code was run and viewed locally.

• [x] Yes

Checklist:

• [x] My code follows OCF's coding style guidelines
• [x] I have performed a self-review of my own code
• [x] 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

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