fix(pal-browser): regression in Function.name polyfill on iOS (#20)

src/function-name.js

@@ -2,7 +2,9 @@ if (typeof FEATURE_NO_IE === 'undefined') {
   // Fix Function#name on browsers that do not support it (IE):
   function test() {}
 
-  if (!test.name) {
+  // Fix: don't shorten to `!test.name` as minifiers may remove the `test` function name,
+  // which results in `test.name === ''`, which is falsy.
+  if (test.name === undefined) {
     Object.defineProperty(Function.prototype, 'name', {
       get: function() {
         let name = this.toString().match(/^\s*function\s*(\S*)\s*\(/)[1];