Fix two crashes relating to food (#600)

* Fix crash when eating bread due to a missing prototype

* Fix crash when finishing a food.

It tried to get the transform component of a deleted entity.

Content.Server/GameObjects/Components/Nutrition/FoodComponent.cs

@@ -155,11 +155,12 @@ namespace Content.Server.GameObjects.Components.Nutrition
 
             }
 
+            var position = Owner.Transform.GridPosition;
             Owner.Delete();
 
             if (_finishPrototype != null)
             {
-                var finisher = Owner.EntityManager.SpawnEntity(_finishPrototype, Owner.Transform.GridPosition);
+                var finisher = Owner.EntityManager.SpawnEntity(_finishPrototype, position);
                 if (user.TryGetComponent(out HandsComponent handsComponent) && finisher.TryGetComponent(out ItemComponent itemComponent))
                 {
                     if (handsComponent.CanPutInHand(itemComponent))

Resources/Prototypes/Entities/items/Consumables/food.yml

@@ -178,6 +178,23 @@
   - type: Icon
     sprite: Objects/Food/baguette.rsi
 
+- type: entity
+  name: Bread (slice)
+  parent: FoodBase
+  id: FoodBreadSlice
+  description: 
+  components:
+  - type: Food
+    contents:
+      reagents:
+      - ReagentId: chem.Nutriment
+        Quantity: 8
+    spawn_on_finish: TrashPlate
+  - type: Sprite
+    sprite: Objects/Food/breadslice.rsi
+  - type: Icon
+    sprite: Objects/Food/breadslice.rsi
+
 - type: entity
   name: Banana bread (slice)
   parent: FoodBase