New preset / Indication of vulnerable sectors

core/src/mindustry/world/blocks/defense/turrets/ItemTurret.java

@@ -177,7 +177,7 @@ public class ItemTurret extends Turret{
                 totalAmmo += a;
 
                 //only add ammo if this is a valid ammo type
-                if(ammoTypes.containsKey(item)){
+                if(item != null && ammoTypes.containsKey(item)){
                     ammo.add(new ItemEntry(item, a));
                 }
             }

core/src/mindustry/world/blocks/storage/CoreBlock.java

@@ -210,7 +210,7 @@ public class CoreBlock extends StorageBlock{
             super.onDestroyed();
 
             //add a spawn to the map for future reference - waves should be disabled, so it shouldn't matter
-            if(state.isCampaign() && team == state.rules.waveTeam){
+            if(state.isCampaign() && team == state.rules.waveTeam && team.cores().size <= 1){
                 //do not recache
                 tile.setOverlayQuiet(Blocks.spawn);