Fix crash related to null text

src/ui/message-ui-handler.ts

@@ -48,6 +48,7 @@ export default abstract class MessageUiHandler extends AwaitableUiHandler {
       text = text.slice(0, actionMatch.index) + text.slice(actionMatch.index + actionMatch[2].length + 4);
     }
 
+    if (text) {
       // Predetermine overflow line breaks to avoid words breaking while displaying
       const textWords = text.split(' ');
       let lastLineCount = 1;
@@ -68,6 +69,7 @@ export default abstract class MessageUiHandler extends AwaitableUiHandler {
       }
 
       text = newText;
+    }
 
     if (this.textTimer) {
       this.textTimer.remove();