Fix getting started list

backend/lib/azimutt/services/onboarding_srv.ex

@@ -13,14 +13,18 @@ defmodule Azimutt.Services.OnboardingSrv do
 
   def on_event(%Event{created_by: nil}), do: :ok
 
-  def add_item(%User{} = user, item) do
-    if user && !Enum.member?(user.data.start_checklist, item) do
-      user |> Accounts.set_start_checklist(user.data.start_checklist ++ [item])
-    else
+  def add_item(%User{} = user, item) when not is_nil(user) do
+    start_checklist = if(user.data, do: user.data.start_checklist, else: [])
+
+    if Enum.member?(start_checklist, item) do
       :ok
+    else
+      user |> Accounts.set_start_checklist(start_checklist ++ [item])
     end
   end
 
+  def add_item(user, item) when is_nil(user), do: :ok
+
   def items do
     [
       %{id: "new_project", label: "Create a project and save it", help: "When saving your project, local mode keep all your data on your browser."},

backend/lib/azimutt_web/templates/layout/_organization_right_bar.html.heex

@@ -1,6 +1,6 @@
 <div class="min-h-full pr-4 bg-gray-50 sm:pr-6 lg:pr-8 lg:flex-shrink-0 lg:border-l lg:border-gray-200 xl:pr-0 divide-y">
     <%= render AzimuttWeb.PartialsView, "_blackfriday_card.html", conn: @conn, organization: @organization, plan: @plan.id %>
     <%= render AzimuttWeb.PartialsView, "_streak.html", value: @plan.streak %>
-    <%= render AzimuttWeb.PartialsView, "_start_checklist.html", conn: @conn, organization: @organization, completed: @current_user.data.start_checklist %>
+    <%= render AzimuttWeb.PartialsView, "_start_checklist.html", conn: @conn, organization: @organization, completed: if(@current_user.data, do: @current_user.data.start_checklist, else: []) %>
     <%= render AzimuttWeb.PartialsView, "_activity_feed.html", events: @organization_events %>
 </div>