Add validation in Pleroma.List.create/2

lib/pleroma/list.ex

@@ -109,15 +109,19 @@ def rename(%Pleroma.List{} = list, title) do
   end
 
   def create(title, %User{} = creator) do
-    list = %Pleroma.List{user_id: creator.id, title: title}
+    changeset = title_changeset(%Pleroma.List{user_id: creator.id}, %{title: title})
 
+    if changeset.valid? do
       Repo.transaction(fn ->
-      list = Repo.insert!(list)
+        list = Repo.insert!(changeset)
 
         list
         |> change(ap_id: "#{creator.ap_id}/lists/#{list.id}")
         |> Repo.update!()
       end)
+    else
+      {:error, changeset}
+    end
   end
 
   def follow(%Pleroma.List{following: following} = list, %User{} = followed) do

test/list_test.exs

@@ -15,6 +15,13 @@ test "creating a list" do
     assert title == "title"
   end
 
+  test "validates title" do
+    user = insert(:user)
+
+    assert {:error, changeset} = Pleroma.List.create("", user)
+    assert changeset.errors == [title: {"can't be blank", [validation: :required]}]
+  end
+
   test "getting a list not belonging to the user" do
     user = insert(:user)
     other_user = insert(:user)