BuddyPress Blocks category may cause an error

[imath]

In this topic ​https://buddypress.org/support/topic/since-update-to-5-0-buddypress-freezes-features-of-wordpress-backend/ "chickencurry" reported an error involving the function that is adding the BuddyPress blocks category.

I guess the type needs to be more permissive to avoid it. See attached patch.

[imath]

In 12490:

Edit the type of the bp_block_category() function's second argument

Although this filter should always get a WP_Post as a second argument, it appears there is a risk this function is used directly passing a null value as the second argument. See this ​support topic.

To prevent this risk of notice error, we are making sure the second argument is a WP_Post in a different way.

See #8152 (Trunk)

[imath]

In 12491:

Edit the type of the bp_block_category() function's second argument

Although this filter should always get a WP_Post as a second argument, it appears there is a risk this function is used directly passing a null value as the second argument. See this ​support topic.

To prevent this risk of notice error, we are making sure the second argument is a WP_Post in a different way.

Fixes #8152 (Branch 5.0)