Fix some build warnings (#6832)

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

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

@@ -28,7 +28,7 @@ namespace Content.Server.AI.Utility.Considerations.State
             }
 
             context.GetStoredState(stateData, out StoredStateData<EntityUid> state);
-            return state.GetValue() == null ? 1.0f : 0.0f;
+            return !state.GetValue().IsValid() ? 1.0f : 0.0f;
         }
     }
 }