Merge branch 'bugfix/shoppinglist-get-by-group-id' into 'main'

JSON serialization of shoppinglist has been fixed

Closes #228

See merge request idatt2106-v23-03/backend!174

src/main/java/ntnu/idatt2016/v233/SmartMat/entity/ShoppingList.java

@@ -36,7 +36,7 @@ public class ShoppingList {
 
     @OneToOne(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
     @JoinColumn(name = "group_id")
-    @JsonIgnoreProperties("shoppingList")
+    @JsonIgnoreProperties({"shoppingList", "hibernateLazyInitializer", "handler"})
     private Group group;
 
     @ManyToMany