selectInput() adds whitespace to $onchange as needed.

git-svn-id: http://textpattern.googlecode.com/svn/development/4.x@5386 2fea6a4d-a838-0410-917b-93a53c48e9d2
…when there is something to show, of course.

git-svn-id: http://textpattern.googlecode.com/svn/development/4.x@5387 2fea6a4d-a838-0410-917b-93a53c48e9d2