Ignore email migration when running settings table does not exist

config/initializers/migrate_email_settings.rb

@@ -1,6 +1,8 @@
 OpenProject::Application.configure do
   config.after_initialize do
-    unless Setting.email_delivery_migrated?
+    # settings table may not exist when you run db:migrate at installation
+    # time, so just ignore this block when that happens.
+    if Setting.settings_table_exists_yet? && !Setting.email_delivery_migrated?
       Rails.logger.info "Migrating existing email settings to the settings table..."
       OpenProject::Configuration.migrate_mailer_configuration!
     end