if omniauth is enabled and if there are button_based_providers available show...

if omniauth is enabled and if there are button_based_providers available show the disable OAuth sources

app/views/admin/application_settings/_form.html.haml

@@ -109,6 +109,7 @@
           = f.label :signin_enabled do
             = f.check_box :signin_enabled
             Sign-in enabled
+      - if omniauth_enabled? && !button_based_providers.empty?
         .form-group
           = f.label :disable_oauth_signin_sources, 'Disable OAuth Sign-In sources', class: 'control-label col-sm-2'
           .col-sm-10