Remove useless check

backend/sql/version_1.sql

@@ -257,7 +257,9 @@ CREATE TABLE [ShoppingEntry] (
     -- In both cases [name], [quantity_value], [quantity_unit] and [Servings] are used to display
     -- the entry instead of [Ingredient] data.
     [ingredient_id] INTEGER,
-    [recipe_scheduled_id] INTEGER, -- Can be null when manually added.
+
+    -- Can be null when manually added (entry is not linked to a recipe).
+    [recipe_scheduled_id] INTEGER,
 
     [is_checked] INTEGER NOT NULL DEFAULT FALSE,
 
@@ -269,16 +271,7 @@ CREATE TABLE [ShoppingEntry] (
 
     CHECK (
         length([name]) <= 255 AND
-        ([is_checked] = TRUE OR [is_checked] = FALSE) AND
-        (
-            [recipe_scheduled_id] IS NULL OR
-            (
-                [name] = '' AND
-                [quantity_value] IS NULL AND
-                [quantity_unit] = '' AND
-                [servings] IS NULL
-            )
-        )
+        ([is_checked] = TRUE OR [is_checked] = FALSE)
     ),
 
     FOREIGN KEY([user_id]) REFERENCES [User]([id]) ON DELETE CASCADE,