Diede Exterkate

[The Mockery docs about overloading](https://docs.mockery.io/en/latest/reference/creating_test_doubles.html#overloading) mention: > Using alias/instance mocks across more than one test will generate a fatal error since we can’t have two classes of the same name....

Prevent traversing over a null value

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## Context If an option group is requested that doesn't exist or the option_instance isn't registered yet, you'll get a warning: PHP Warning: foreach() argument must be of type array|object,...