remove unnecessary warning

node_modules/architect-build/build_support/mini_require.js

@@ -47,7 +47,7 @@ var define = function(name, deps, callback) {
     
     define.loaded[name] = {
         id: name,
-        deps: normalizeNames(name, deps),
+        deps: normalizeNames(name, deps || []),
         factory: callback,
         exports: {},
         packaged: true
@@ -100,7 +100,6 @@ var processLoadQueue = function(err, id) {
     } else if (id && !defQueue.length && !define.loaded[id]) {
         // the script didn't call define
         defQueue = [config.shim && config.shim[id] || [[], null]];
-        console.error("require shims not supported");
     }
     
     if (defQueue.length) {
@@ -211,7 +210,8 @@ var _require = function(parentId, moduleName, callback, errback) {
         var depName = normalizeName(parentId, moduleName);
         var module = lookup(depName);
         if (module !== undefined) {
-            callback && callback(module);
+            if (typeof callback == "function")
+                callback(module);
             return module;
         }
     } else if (Array.isArray(moduleName)) {