send error notification over websocket if tts fails

lib/tasks/say.js

@@ -51,6 +51,7 @@ class TaskSay extends Task {
           alert_type: AlertType.TTS_NOT_PROVISIONED,
           vendor
         }).catch((err) => this.logger.info({err}, 'Error generating alert for no tts'));
+        this.notifyError(`No speech credentials have been provisioned for ${vendor}`);
         throw new Error('no provisioned speech credentials for TTS');
       }
       // synthesize all of the text elements
@@ -96,6 +97,7 @@ class TaskSay extends Task {
             vendor,
             detail: err.message
           }).catch((err) => this.logger.info({err}, 'Error generating alert for tts failure'));
+          this.notifyError(err.message || err);
           return;
         }
       };