Chargeprice: Fix switching between vehicles

app/src/main/java/net/vonforst/evmap/fragment/ChargepriceFragment.kt

@@ -168,7 +168,7 @@ class ChargepriceFragment : Fragment() {
             chargepriceAdapter.myTariffsAll = it
         }
         vm.chargePricesForChargepoint.observe(viewLifecycleOwner) {
-            it?.data?.let { chargepriceAdapter.submitList(it) }
+            chargepriceAdapter.submitList(it?.data ?: emptyList())
         }
 
         val connectorsAdapter = CheckableConnectorAdapter()

app/src/main/java/net/vonforst/evmap/viewmodel/ChargepriceViewModel.kt

@@ -116,6 +116,7 @@ class ChargepriceViewModel(
         MediatorLiveData<Resource<List<ChargePrice>>>().apply {
             value = state["chargePrices"] ?: Resource.loading(null)
             listOf(
+                vehicle,
                 batteryRange,
                 batteryRangeSliderDragging,
                 vehicleCompatibleConnectors,