fixup! fix(input[text]): composing function dosen't works properly in IE

Author: Narretz

src/ng/directive/input.js

@@ -1253,7 +1253,9 @@ function baseInputType(scope, element, attr, ctrl, $sniffer, $browser) {
       // End composition when ev.data is empty string on 'compositionupdate' event.
       // When the input de-focusses (e.g. by clicking away), IE triggers 'compositionupdate'
       // instead of 'compositionend'.
-      if (ev.data === '') composing = false;
+      if (isUndefined(ev.data) || ev.data === '') {
+        composing = false;
+      }
     });
 
     element.on('compositionend', function() {