add validator to check for issues in the component.json file

Author: vicapow

lib/builder.js

@@ -342,12 +342,13 @@ Builder.prototype.append = function(str){
 Builder.prototype.json = function(fn){
   var self = this;
   var cache = this._cache;
-
+  
+  // conf has already been validated
   if (this.conf) return fn(null, this.conf);
 
   var path = this.path('component.json');
   var conf = cache[path];
-  if (conf) return fn(null, this.conf = conf);
+  if (conf) return validate(this.conf);
 
   debug('reading %s', path);
   fs.readFile(path, 'utf8', function(err, str){
@@ -359,11 +360,17 @@ Builder.prototype.json = function(fn){
         self._emittedConfig = true;
         self.emit('config');
       }
-      fn(null, self.conf);
+      validate(self.conf);
     } catch (err) {
       fn(err);
     }
   });
+  
+  function validate(conf){
+    if(!conf.name) return fn(new Error( path + " attribute \"name\" missing"));
+    self.conf = conf;
+    fn(null, conf);
+  }
 };
 
 /**