fixed empty name of member list

app/models/user/user.rb

@@ -156,7 +156,13 @@ class User
     if info
       first_name = get_attribute_values.detect {|value| value.key.to_s.eql?('first_name') }[I18n.locale.to_s] rescue nil
       last_name = get_attribute_values.detect {|value| value.key.to_s.eql?('last_name') }[I18n.locale.to_s] rescue nil
-      return "#{last_name} #{first_name}"
+      full_name = "#{last_name} #{first_name}"
+
+      if full_name.strip.empty?
+        full_name = email
+      end
+
+      return full_name
     else
       return nil
     end