fix: Messages

- update messages according to new doctype
- sync logo in seller registration
- hub.is_seller_registered() and hub.is_user_registered() api
- Add Users dialog

erpnext/public/js/hub/vue-plugins.js

@@ -62,5 +62,5 @@ Vue.directive('img-src', {
 });
 
 Vue.filter('striphtml', function (text) {
-	return strip_html(text);
+	return strip_html(text || '');
 });