bug fix: notices IS data was missing in annual-road-transport-distanc…

…e-demand.csv, so went over code again and realised, that transport_energy_balance wasn't complemented with fill_missing_countries_and_years and therefore in the creation of transport_energy_per_mode, IS was not computed and therefore later not used to fill jrc data

scripts/transport/annual_transport_demand.py

@@ -86,7 +86,7 @@ def get_all_distance_efficiency(
     energy_balances, cat_name, energy_df, distance_df, unique_dim, other_transport_road=0
 ):
 
-    transport_energy_balance = (
+    transport_energy_balance = fill_missing_countries_and_years(
         energy_balances
         .xs(cat_name)
         .unstack('carrier_code')