in libraries/ActivityEx.cs [167:190]
        public bool HasContent()
        {
            if (!string.IsNullOrWhiteSpace(Text))
            {
                return true;
            }
            if (!string.IsNullOrWhiteSpace(Summary))
            {
                return true;
            }
            if (Attachments != null && Attachments.Any())
            {
                return true;
            }
            if (ChannelData != null)
            {
                return true;
            }
            return false;
        }