[WIP] Make AndroidDevice#build_info strictly returns a dict #924
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Now AndroidDevice#build_info returns a None when in fastboot and a dict otherwise.
I'm not quite sure if we were intentionally returning a None when the device is in fastboot. But I think making it strictly return a dict looks more reliable. So users won't get errors like
"TypeError: 'NoneType' object is not subscriptable"
WDYT @xpconanfan ?
This change is