Mojo javascript encoder: Empty string encoded as NULL.

mojo/public/js/bindings/codec.js

Index: mojo/public/js/bindings/codec.js
diff --git a/mojo/public/js/bindings/codec.js b/mojo/public/js/bindings/codec.js
index 88433e2fc4bc40f6646e373ad0a0fb4dccf379f7..623cca71b66ff334e41f72173997199cbd410e52 100644
--- a/mojo/public/js/bindings/codec.js
+++ b/mojo/public/js/bindings/codec.js
@@ -316,7 +316,8 @@ define("mojo/public/js/bindings/codec", [
   };
 
   Encoder.prototype.encodeStructPointer = function(cls, val) {
-    if (!val) {
+    if (val == null) {
+      // Also handles undefined, since undefined == null.
       this.encodePointer(val);
       return;
     }
@@ -325,7 +326,8 @@ define("mojo/public/js/bindings/codec", [
   };
 
   Encoder.prototype.encodeArrayPointer = function(cls, val) {
-    if (!val) {
+    if (val == null) {
+      // Also handles undefined, since undefined == null.
       this.encodePointer(val);
       return;
     }
@@ -337,7 +339,8 @@ define("mojo/public/js/bindings/codec", [
   };
 
   Encoder.prototype.encodeStringPointer = function(val) {
-    if (!val) {
+    if (val == null) {
+      // Also handles undefined, since undefined == null.
       this.encodePointer(val);
       return;
     }