fix: ChatSession.getTranscript() fails without arguments; closes #128 (…

…#195)

src/core/chatController.js

@@ -181,7 +181,7 @@ class ChatController {
             .catch(this.handleRequestFailure(metadata, ACPS_METHODS.SEND_EVENT, startTime, args.contentType));
     }
 
-    getTranscript(inputArgs) {
+    getTranscript(inputArgs = {}) {
         if (!this._validateConnectionStatus('getTranscript')) {
             return Promise.reject(`Failed to call getTranscript, No active connection`);
         }