chore: don't raise an exception if there are no stores in DB

Author: did

config/initializers/check_maglev_migration.rb

@@ -1,9 +1,5 @@
 # frozen_string_literal: true
 
-module Maglev
-  class MigrationV2Error < StandardError; end
-end
-
 Rails.application.config.after_initialize do
   # Skip in test environment
   # Only check if we're running the server or console
@@ -12,8 +8,7 @@ class MigrationV2Error < StandardError; end
     store_exists = Maglev::SectionsContentStore.exists?
 
     if site_exists && !store_exists
-      raise Maglev::MigrationV2Error,
-            'Your Maglev site needs to be migrated to V2. Please run: rails maglev:upgrade_from_v1'
+      Rails.logger.warn '🚨🚨🚨 Your Maglev site needs to be migrated to V2. Please run: rails maglev:upgrade_from_v1'
     end
   end
 end

lib/generators/maglev/templates/theme/app/theme/theme.yml.tt

@@ -39,6 +39,10 @@ pages:
 - title: "Home page"
   path: "/index"
   layout_id: "default"  # Use the default layout
+  sections_content:
+    header: []
+    main: []
+    footer: []
 
 # List of CSS class names used by your library of icons (font awesome, remixicons, ...etc)
 icons: []