Debug notice when trying to activate sign-ups previous to BuddyPress being active

[johnjamesjacoby]

When trying to activate a pending sign-up for a user who did so before BuddyPress was active, the admin will be presented with a debug notice.

This is because the profile_field_ids sign-up meta key is assumed to always exist, though it won't for sign-ups that weren't from BuddyPress's registration form.

Patch imminent.

[johnjamesjacoby]

In 11435:

Sign-ups: Prevent debug notice when trying to activate a user who signed up not through BuddyPress's registration form.

Fixes #7447. (In 2.8 branch, for 2.8.1)

[johnjamesjacoby]

In 11437:

Sign-ups: Prevent debug notice when trying to activate a user who signed up not through BuddyPress's registration form.

Fixes #7447. (In trunk, for 2.9.0)