city_total_unit_gold_upkeep() : Duplicate unit_list_size() check
city_total_unit_gold_upkeep() checks if unit_list_size() is at least one, before iterating the list. That's redundant check, as iteration over zero item list would do nothing. Simplify the code by removing the check.
city_total_unit_gold_upkeep() checks if unit_list_size() is at least one, before iterating the list. That's redundant check, as iteration over zero item list would do nothing. Simplify the code by removing the check.