Give a warning when calls undefined macro.

Author: fool2fish

examples/data-structure/index.vm

@@ -6,6 +6,8 @@ $user.favorites[$favIdx]
 
 $order.orderId
 
+#undfinedMacro()
+
 #set($temp = 1)
 #set($addr = $order.addr)
 $addr.zipCode

lib/data/data-direc.js

@@ -167,12 +167,13 @@ module.exports = {
 
     var definition = this.template.__macro[name] || this.macro[name]
     if (!definition) {
-      this.throwError('Call undefined macro.', node.pos)
+      logger.warn('Call undefined macro <', name, '>')
+      return
     }
-    var definitionTempl = name in this.template.__macro ? this.template : definition.__template
-
     if (!definition.body) return
 
+    var definitionTempl = name in this.template.__macro ? this.template : definition.__template
+
     var ctx = {}
     var args = node.arguments
     var argsLen = args.length