can do this

selfdrive/car/ford/interface.py

@@ -42,8 +42,9 @@ class CarInterface(CarInterfaceBase):
     else:
       # Lock out if the car does not have needed lateral and longitudinal control APIs.
       # Note that we also check CAN for adaptive cruise, but no known signal for LCA exists
-      pscm_config = next((fw.response for fw in car_fw if fw.ecu == Ecu.eps and b'\x22\xDE\x01' in fw.request), None)
-      if pscm_config is None or len(pscm_config) != 24:
+      pscm_config = next((fw.response for fw in car_fw if fw.ecu == Ecu.eps and b'\x22\xDE\x01' in fw.request), b"")
+      if not docs:
+        if len(pscm_config) != 24:
           ret.dashcamOnly = True
         else:
           config_tja = pscm_config[7]  # Traffic Jam Assist