zendframework/zf1 — pull request #209 by mhujer (2013-10-10 14:15:52+00:00)
Title: Empty action form attribute is not rendered in HTML5

"The action and formaction content attributes, if specified, must have a value that is a valid non-empty URL"
(http://www.w3.org/html/wg/drafts/html/master/forms.html#attr-fs-action)