message: Disallow sending of empty messages
diff: @@ -308,6 +308,9 @@ export default class SendMessageComposer extends React.Component {
  const startTime = CountlyAnalytics.getTimestamp();
  const {roomId} = this.props.room;
  const content = createMessageContent(this.model, this.props.permalinkCreator, replyToEvent);
  + // don't bother sending an empty message
  + if (!content.body.trim()) return;
  +
  const prom = this.context.sendMessage(roomId, content);
  if (replyToEvent) {
  // Clear reply_to_event as we put the message into the queue
  