We don't get any values for some devices since 13/14 September (but we get for Moto), lets check if something has happened at WebPageTest.org.
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The tests seems empty:
https://www.webpagetest.org/results.php?test=160922_HA_1ZNQ&medianRun=fastest&medianMetric=SpeedIndex
Need to collect a couple of runs and create an issue at Github.