fix: set odometer sensors to None if measurements is missing

[neubi4]

This fixes #77 by setting odometer values to none if measurements dict is missing in data dict.

[daernsinstantfortress]

I'll take a look at this later to see how it behaves.

[delormejonathan]

Works perfectly with my hybrid Formentor, thank you! I noticed that the odometer sensors are showing as disabled, but my main interest is in controlling the climate, so this isn't a major issue for me.