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It seems like 'date_time' dict entry is not populated for v1 of the airwave, which causes _get_service_characteristics to throw an error. I'm not sure why this is the case or what the expectation is, but since the date_time entry is getting popped anyways, I figured that adding a condition guard is the quickest/easiest fix.
After this change I can import the sensor into home assistant, whereas prior to change adding the integration would fail with
[homeassistant.components.airthings_ble.config_flow] Unknown error occurred from CC:78:AB:15:75:02: 'date_time'