Fix PYSON and JSON for null value

src/pyson.js

@@ -54,7 +54,7 @@
         },
         decode: function(str) {
             var reviver = function(k, v) {
-                if (typeof v == 'object') {
+                if (typeof v == 'object' && v !== null) {
                     var cls = Sao.PYSON[v.__class__];
                     if (cls) {
                         return cls.eval_(v, this.__context);

src/rpc.js

@@ -64,7 +64,7 @@
                Sao.rpc.convertJSONObject(value[i], i, value);
            }
        } else if ((typeof(value) != 'string') &&
-           (typeof(value) != 'number')) {
+           (typeof(value) != 'number') && (value !== null)) {
            if (value && value.__class__) {
                switch (value.__class__) {
                    case 'datetime':
@@ -101,7 +101,8 @@
             for (var i = 0, length = value.length; i < length; i++) {
                 Sao.rpc.prepareObject(value[i], i, value);
             }
-        } else if ((typeof(value) != 'string') && (typeof(value) != 'number')) {
+        } else if ((typeof(value) != 'string') &&
+                (typeof(value) != 'number') && (value !== null)) {
             if (value instanceof Date) {
                 if (value.getHours() || value.getMinutes() ||
                         value.getSeconds())

tests/sao.js

@@ -20,16 +20,28 @@
             },
             'datetime': new Date(2012, 11, 29, 19, 59, 10),
             'date': new Date(2012, 11, 29),
-            'decimal': new Sao.Decimal(1.1)
+            'decimal': new Sao.Decimal(1.1),
+            'null': null
         };
         for (var name in tests) {
             var test = tests[name];
             var result = Sao.rpc.convertJSONObject(jQuery.parseJSON(
                     JSON.stringify(Sao.rpc.prepareObject(test))));
-            QUnit.ok(test.toString() == result.toString(), 'JSON ' + name);
+            var ok_;
+            if (name == 'null') {
+                ok_ = test == result;
+            } else {
+                ok_ = test.toString() == result.toString();
+            }
+            QUnit.ok(ok_, 'JSON ' + name);
         }
     });
 
+    QUnit.test('PYSON Decoder', function() {
+        var decoder = new Sao.PYSON.Decoder();
+        QUnit.strictEqual(decoder.decode('null'), null, "decode('null')");
+    });
+
     QUnit.test('PYSON.Eval', function() {
         var value;
         value = new Sao.PYSON.Eval('test').pyson();