Fix AI shutting storage crash (#1344)

Co-authored-by: Metal Gear Sloth <metalgearsloth@gmail.com>

Content.Server/AI/Utility/Considerations/State/StoredStateEntityIsNullCon.cs

@@ -1,6 +1,7 @@
 using System;
 using Content.Server.AI.WorldState;
 using Content.Server.AI.WorldState.States.Utility;
+using Robust.Shared.Interfaces.GameObjects;
 
 namespace Content.Server.AI.Utility.Considerations.State
 {
@@ -20,7 +21,8 @@ namespace Content.Server.AI.Utility.Considerations.State
         protected override float GetScore(Blackboard context)
         {
             var stateData = context.GetState<StoredStateIsNullState>().GetValue();
-            return stateData == null ? 1.0f : 0.0f;
+            context.GetStoredState(stateData, out StoredStateData<IEntity> state);
+            return state.GetValue() == null ? 1.0f : 0.0f;
         }
     }
 }

Content.Server/AI/WorldState/Blackboard.cs

@@ -56,9 +56,9 @@ namespace Content.Server.AI.WorldState
             }
         }
 
-        public void GetState(Type type, out IAiState state)
+        public void GetStoredState<T>(Type type, out StoredStateData<T> state)
         {
-            state = _states[type];
+            state = (StoredStateData<T>) _states[type];
         }
 
         /// <summary>

Content.Server/AI/WorldState/StateData.cs

@@ -25,10 +25,7 @@ namespace Content.Server.AI.WorldState
         void CheckCache();
     }
 
-    public interface IStoredState
-    {
-        
-    }
+    public interface IStoredState {}
 
     /// <summary>
     /// The default class for state values. Also see CachedStateData and PlanningStateData