using '== null' to check for soaked accessor chains instead of '== undefined' -- shorter, and slightly safer

lib/nodes.js

@@ -316,7 +316,7 @@
   // A value, indexed or dotted into, or vanilla.
   ValueNode = (exports.ValueNode = inherit(Node, {
     type: 'Value',
-    SOAK: " == undefined ? undefined : ",
+    SOAK: " == null ? undefined : ",
     constructor: function constructor(base, properties) {
       this.children = flatten([(this.base = base), (this.properties = (properties || []))]);
       return this;

src/nodes.coffee

@@ -228,7 +228,7 @@ statement ReturnNode, true
 ValueNode: exports.ValueNode: inherit Node, {
   type: 'Value'
 
-  SOAK: " == undefined ? undefined : "
+  SOAK: " == null ? undefined : "
 
   constructor: (base, properties) ->
     @children:   flatten [@base: base, @properties: (properties or [])]