Fixes an issue where all member edit panels disappear if you don't ha…

[JarrydLong]

…ve an opt-in list setup

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• Does your code follow the WordPress' coding standards?
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Changes proposed in this Pull Request:

Returns the existing panels if there are no opt-in lists

How to test the changes in this Pull Request:

1. Navigate to Memberships > Members and edit a member
2. All panels should still show even if there aren't any opt-in lists available

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you successfully run tests with your changes locally?