Fix: Prevent error with unsaved or malformed email whitelist #7509
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Resolves GIVE-1153
Description
This PR prevents non-array values from causing an error when validating against whitelisted email addresses.
Affects
Adds a type hint when constructing the whitelist.
Adds a type cast when resolving the whitelist from the container.
Testing Instructions
Pre-review Checklist
@unreleased
tags included in DocBlocks