Fix bug with percent formats with no integer part

test/number_format_test.dart

Index: test/number_format_test.dart
diff --git a/test/number_format_test.dart b/test/number_format_test.dart
index 1ff898b2c1a01ac0c1037bd5ea41d026773ece6c..b6bc33a0be834f32b68323758c6ca87b48dff05a 100644
--- a/test/number_format_test.dart
+++ b/test/number_format_test.dart
@@ -143,6 +143,14 @@ main() {
     }
   });
 
+  test('Percent with no decimals and no integer part', () {
+    var number = new NumberFormat("#%");
+      var formatted = number.format(0.12);
+      expect(formatted, "12%");
+      var readBack = number.parse(formatted);
+      expect(0.12, readBack);
+  });
+
   // We can't do these in the normal tests because those also format the
   // numbers and we're reading them in a format where they won't print
   // back the same way.