fix cost.enabled setting when nil

[tongueroo]

This is a 🐞 bug fix.

• [ ] I've added tests (if it's a bug, feature or enhancement)
• [ ] I've adjusted the documentation (if it's a feature or enhancement)
• [x] The test suite passes (run bundle exec rspec to verify this)

Summary

Fix cost.enabled setting when nil

How to Test

Sanity check

Version Changes

Patch