bp_blogs_record_post() uses activity meta functions without checking if activity component is active

[r-a-y]

See:
​https://buddypress.org/support/topic/blog-post-mail-notification-error/

Caused by me in r8944. My bad!

[boonebgorges]

D'oh :)

[r-a-y]

In 9038:

Blogs: Check if activity component is active before using activity meta functions.

Previously, r8944 used some functions to mirror the blog post title to the
activity meta table. However, a check was not made to determine if the
activity component was active. This caused a fatal error for sites that
have the activity component disabled.

Fixes #5897 (2.1-branch).

Anti-props r-a-y.

[r-a-y]

In 9039:

Blogs: Check if activity component is active before using activity meta functions.

Previously, r8944 used some functions to mirror the blog post title to the
activity meta table. However, a check was not made to determine if the
activity component was active. This caused a fatal error for sites that
have the activity component disabled.

Fixes #5897 (trunk).

Anti-props r-a-y.