Disabling default OG notifications causes Strict warnings when other modules use hook_default_rules_config

Issue Summary

I have some Commons installed alongside Drupal Commerce. When I visit the Feature that handles all these dependencies, I am seeing some PHP warnings.

I inserted a krumo dump above to see how many times hook_default_rules_configuration_alter was called. We can see its called 5 times (by various Commerce modules) before commons_groups.module instantiates it.

The commons code assumes $configs['rules_og_member_active'] is available to modify. 5/6 times, its not part of the configs array.

Checking to see if this key exists before assigning anything to the object should prevent this from happening.