Change the WHERE clause when using WordPress comments as the object type. Pods enters "comment" into the "comment_type" field, but WordPress will leave that field blank unless it's a special comment type (like a pingback for instance). The update will search for both "comment" and a blank string to cover both cases when no other comment type is passed in.
Merge remote-tracking branch 'origin/2.x' into 2.x

Conflicts:
	classes/PodsAPI.php