small fix

lib/widgets/text_line.dart

@@ -156,10 +156,11 @@ class TextLine extends StatelessWidget {
           double fontSize = double.tryParse(size.value);
           if (fontSize != null) {
             res = res.merge(TextStyle(fontSize: fontSize));
-          } else
+          } else {
             throw "Invalid size ${size.value}";
           }
       }
+    }
 
     Attribute color = textNode.style.attributes[Attribute.color.key];
     if (color != null && color.value != null) {

lib/widgets/toolbar.dart

@@ -742,8 +742,7 @@ class _HistoryButtonState extends State<HistoryButton> {
   }
 
   void _setIconColor() {
-
-    if(!mounted) return;
+    if (!mounted) return;
 
     if (widget.undo) {
       setState(() {