Use sector preset name for maps if possible

core/src/mindustry/core/World.java

@@ -268,7 +268,7 @@ public class World{
     }
 
     private void setSectorRules(Sector sector){
-        state.map = new Map(StringMap.of("name", sector.planet.localizedName + "; Sector " + sector.id));
+        state.map = new Map(StringMap.of("name", sector.preset == null ? sector.planet.localizedName + "; Sector " + sector.id : sector.preset.localizedName));
         state.rules.sector = sector;
 
         state.rules.weather.clear();

core/src/mindustry/world/blocks/power/PowerGraph.java

@@ -12,17 +12,6 @@ public class PowerGraph{
     private static final Seq<Building> outArray1 = new Seq<>();
     private static final Seq<Building> outArray2 = new Seq<>();
     private static final IntSet closedSet = new IntSet();
-    private static final PowerGraph nullGraph = new PowerGraph(){
-        @Override
-        public void add(Building build){
-            throw new RuntimeException("cannot add to null graph");
-        }
-
-        @Override
-        public void addGraph(PowerGraph graph){
-            throw new RuntimeException("cannot add to null graph");
-        }
-    };
 
     private final Seq<Building> producers = new Seq<>(false);
     private final Seq<Building> consumers = new Seq<>(false);