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It would be good to document quirks like returning an empty string for pages without a title.
This is related to a specific change made in ChromeDriver 2.21 to make their driver more consistent. http://chromedriver.storage.googleapis.com/2.22/notes.txt
Bah, so apparently the spec just said the wrong thing here. https://github.com/w3c/webdriver/pull/319 to fix it.
landed in cefc45f
Cheers chaps!