#2390 and [4117] break ajax post meta and sometimes draft saving

[mdawaffe]

[4117] causes wp_insert_post() to bail if the title and content are empty.

Ajax post meta is broken: When meta data is added on a fresh post (i.e., one that has not yet been saved to the DB), ajax post meta creates an empty post onto which it attaches the meta data. This is no longer possible.

Saving drafts is sometimes broken: Suppose someone starts writing the excerpt but does not yet have a title nor anything in the post box. Saving it as a draft kills their work.

[4259] for the excerpt issue. Not sure what to do about ajax post meta. Use a temporary title?

post_title => "Draft created on $date at $time"

How's this?

3097.diff

1. post_title => "Draft created on $date at $time"

(In [4570]) Use temporary title when creating empty posts. Props mdawaffe. fixes #3097