Adding validation for invalid qnajson and fixing commands doc reference

Author: munozemilio

packages/cli/scripts/postinstall.js

@@ -50,7 +50,7 @@ const getUserConfig = async () => {
         userConfig.telemetry = false
         console.log(chalk.blue('Telemetry will remain disabled'))
         console.log(chalk.blue('At any time you may enable data collection by changing the configuration using command:'))
-        console.log(chalk.blue('bf config:telemetry:enable'))
+        console.log(chalk.blue('bf config:set:telemetry --enable'))
       }
 
       await fs.mkdirp(pathToConfigJson)

packages/cli/src/hooks/init/inithook.ts

@@ -78,7 +78,7 @@ const hook: Hook<'init'> = async function (opts) {
         userConfig.telemetry = false
         this.log(chalk.blue('Telemetry will remain disabled'))
         this.log(chalk.blue('At any time you may enable data collection by changing the configuration using command:'))
-        this.log(chalk.blue('bf config:telemetry:enable'))
+        this.log(chalk.blue('bf config:set:telemetry --enable'))
       }
 
       await writeUserConfig(userConfig)

packages/lu/src/parser/converters/qnajsontoqnaconverter.js

@@ -53,6 +53,11 @@ module.exports = {
         } else {
             root = QnAJSON.qnaList;
         }
+        
+        if (!root) {
+            throw (new exception(retCode.errorCode.INVALID_INPUT_FILE, 'No input QnA content found '));
+        }
+
         if(root.length > 0) {
             root.forEach(function(qnaItem) {
                 fileContent += '> Source: ' + qnaItem.source + NEWLINE;