Fix minor blips in thrown errors

Author: khorwood-openai

Diff for: lib/client.js

@@ -417,8 +417,8 @@ export class RealtimeClient extends RealtimeEventHandler {
    */
   disconnect() {
     this.sessionCreated = false;
-    this.conversation.clear();
     this.realtime.isConnected() && this.realtime.disconnect();
+    this.conversation.clear();
   }
 
   /**

Diff for: lib/conversation.js

@@ -126,6 +126,9 @@ export class RealtimeConversation {
     },
     'input_audio_buffer.speech_stopped': (event, inputAudioBuffer) => {
       const { item_id, audio_end_ms } = event;
+      if (!this.queuedSpeechItems[item_id]) {
+        this.queuedSpeechItems[item_id] = { audio_start_ms: audio_end_ms };
+      }
       const speech = this.queuedSpeechItems[item_id];
       speech.audio_end_ms = audio_end_ms;
       if (inputAudioBuffer) {