fix handling non string text

lib/tasks/cognigy/index.js

@@ -23,7 +23,7 @@ const parseQuickReplies = (obj) => {
 
 const parseBotText = (evt) => {
   const {text, data} = evt;
-  if (text) return text;
+  if (text !== undefined) return String(text);
 
   switch (data?.type) {
     case 'quickReplies':