per recommendation from microsoft, do NOT sort transcripts by confidence: first transcript in the returned list is 'best'

lib/tasks/transcribe.js

@@ -253,6 +253,11 @@ class TaskTranscribe extends Task {
       evt = newEvent;
     }
 
+    if (evt.alternatives[0].transcript === '' && !cs.callGone && !this.killed) {
+      this.logger.info({evt}, 'TaskGather:_onTranscription - got empty transcript, listen again');
+      return this._transcribe(ep);
+    }
+
     if (this.transcriptionHook) {
       const b3 = this.getTracingPropagation();
       const httpHeaders = b3 && {b3};