Fixed occasional selenium test failure on Jenkins with Chrome 36.

Previously find_element_by_id('id_password') on the next line failed with
NoSuchElementException and selenium.page_source was
<html xmlns="http://www.w3.org/1999/xhtml"><head></head><body></body></html>.

Possibly related: https://code.google.com/p/selenium/issues/detail?id=1969.