Memoized module function with support for 'dot.notated.namespacing'

example.js

var m1 = module('modules.galore.yo');

m1.foo = 'bar';

var m2 = module('modules.galore')
console.log(m2); // { yo: { foo: 'bar' } }

module.js

var module = function () {
  var modules = {};

	return function (namespace) {
		var nodes = namespace.split('.'),
			lastNode;

		_.each(nodes, function (node) {
			// handle first iteration
			if (!lastNode) {
				modules[node] = modules[node] || {};
				lastNode = modules[node];
			} else {
				lastNode[node] = lastNode[node] || {};
				lastNode = lastNode[node];
			}
		})
		return lastNode;
	}
}();

Missing semicolons on lines 17 & 19. Don't give me none of that ASI jabba!