get_stats() raises TypeError when the API returns result: null

[don4of4]

In get_stats() on main:

info, sw_data = await asyncio.gather(*tasks)
data = info["runtimeData"]   # TypeError when info is None
if data is None:             # the guard is one line too late
    raise InvalidDataException

get_composite_info() returns (await self._get(url, params))["result"], which is None when the API replies result: null — seen intermittently on working accounts (richo/homeassistant-franklinwh#82, and reproduced on mine). Callers get TypeError: 'NoneType' object is not subscriptable instead of InvalidDataException.

data = info.get("runtimeData") if info else None before the check fixes it.