chore: use Boolean to filter TemplateChildNode (#569)

packages/compiler-core/src/parse.ts

@@ -233,7 +233,7 @@ function parseChildren(
     }
   }
 
-  return removedWhitespace ? nodes.filter(node => node !== null) : nodes
+  return removedWhitespace ? nodes.filter(Boolean) : nodes
 }
 
 function pushNode(nodes: TemplateChildNode[], node: TemplateChildNode): void {