Wikimedia Bugzilla is closed!

If you use the + button to add a new comment (with title) to a blank page, MW
inserts a blank line above your posting, leaving an odd gap at the top of the page.

I don't know if this also affects adding a message to a page that doesn't exist,
or whether it only affects blanked pages.

The code should test whether the page is blank, and only add the newline if it
is not.