remove useless code (#4017)

src/components/Charts/Pie/index.js

@@ -151,7 +151,6 @@ class Pie extends Component {
     let tooltip = propsTooltip;
 
     const defaultColors = colors;
-    data = data || [];
     selected = selected || true;
     tooltip = tooltip || true;
     let formatColor;

src/utils/utils.js

@@ -152,7 +152,7 @@ export function isUrl(path) {
 
 export function formatWan(val) {
   const v = val * 1;
-  if (!v || Number.isNaN(v)) return '';
+  if (!v) return '';
 
   let result = val;
   if (val > 10000) {