Fix 19029: handle special case when on-handler is empty in polymer, add better

pkg/polymer/test/build/script_compactor_test.dart

Index: pkg/polymer/test/build/script_compactor_test.dart
diff --git a/pkg/polymer/test/build/script_compactor_test.dart b/pkg/polymer/test/build/script_compactor_test.dart
index a2dc1c672ae43be40adcb1acdba54d166e3aaba7..9220c46fda2b60bb36b0db7a5631ade17a212b53 100644
--- a/pkg/polymer/test/build/script_compactor_test.dart
+++ b/pkg/polymer/test/build/script_compactor_test.dart
@@ -656,15 +656,17 @@ codegenTests(phases) {
           '<div>{{anotherNode}}</div>'
           '<div>{{a.call1(a)}}</div>'
           '<div>{{call2(a)}}</div>'
+          '<div>{{}}</div>'
           '<div class="{{an.attribute}}"></div>'
           '<a href="path/{{within.an.attribute}}/foo/bar"></a>'
           '<div data-attribute="{{anotherAttribute}}"></div>'
           // input and custom-element attributes are treated as 2-way bindings:
-          '<input value="{{this.is.twoWay}}">'
-          '<input value="{{this.is.twoWayInt | intToStringTransformer}}">'
+          '<input value="{{this.iS.twoWay}}">'

[Siggi Cherem (dart-lang), 2014/05/29 00:05:18]

"is" is a reserved word, so now smoke made this part of the test fail.

[Jennifer Messerly, 2014/05/29 00:27:42]

interesting! longer term we might have an issue there. filed
https://code.google.com/p/dart/issues/detail?id=19069

+          '<input value="{{this.iS.twoWayInt | intToStringTransformer}}">'
           '<something-else my-attribute="{{here.too}}"></something-else>'
           '<div on-click="{{methodName}}"></div>'
           '<div on-click="{{@read.method}}"></div>'
+          '<div on-click="{{}}"></div>'
           '</template></polymer-element>',
       'a|web/test.html._data': expectedData(['web/a.dart']),
       'a|web/a.dart':
@@ -689,8 +691,8 @@ codegenTests(phases) {
                   #call1: (o) => o.call1,
                   #call2: (o) => o.call2,
                   #here: (o) => o.here,
+                  #iS: (o) => o.iS,
                   #intToStringTransformer: (o) => o.intToStringTransformer,
-                  #is: (o) => o.is,
                   #method: (o) => o.method,
                   #methodName: (o) => o.methodName,
                   #node: (o) => o.node,
@@ -714,8 +716,8 @@ codegenTests(phases) {
                   #call1: r'call1',
                   #call2: r'call2',
                   #here: r'here',
+                  #iS: r'iS',
                   #intToStringTransformer: r'intToStringTransformer',
-                  #is: r'is',
                   #method: r'method',
                   #methodName: r'methodName',
                   #node: r'node',