nit

src/h.ts

@@ -24,7 +24,7 @@ export function h(sel: string, data: VNodeData | null, children: VNodeChildren):
 export function h(sel: any, b?: any, c?: any): VNode {
   var data: VNodeData = {}, children: any, text: any, i: number;
   if (c !== undefined) {
-    if (b !== null) data = b;
+    if (b !== null) { data = b; }
     if (is.array(c)) { children = c; }
     else if (is.primitive(c)) { text = c; }
     else if (c && c.sel) { children = [c]; }