BP_Component fails to register component in loaded_components in some cases

[boonebgorges]

If you extend BP_Component without setting $this->slug in your component, things get messed up. For one thing, you get a fatal error when BP loops through loaded_components in bp_core_activation_notice(), because the component_id is empty for the component in question.

This will only be a problem in edge cases where components do not register their globals properly. However, we can avoid even these problems by making sure that $bp->{$component}->slug has a default value, which would logically be $bp->{$component}->id.

[boonebgorges]

(In [5147]) Ensure that extensions of BP_Component have a default slug property. Fixes #3577