Merge branch '4.x' into wycats-master

# Conflicts:
#	package.json

lib/handlebars/base.js

@@ -4,7 +4,7 @@ import {registerDefaultHelpers} from './helpers';
 import {registerDefaultDecorators} from './decorators';
 import logger from './logger';
 
-export const VERSION = '4.0.7';
+export const VERSION = '4.0.8';
 export const COMPILER_REVISION = 7;
 
 export const REVISION_CHANGES = {

lib/handlebars/runtime.js

@@ -221,7 +221,8 @@ export function invokePartial(partial, context, options) {
     options.data = createFrame(options.data);
     // Wrapper function to get access to currentPartialBlock from the closure
     let fn = options.fn;
-    partialBlock = options.data['partial-block'] = function partialBlockWrapper(context, options) {
+    partialBlock = options.data['partial-block'] = function partialBlockWrapper(context, options = {}) {
+
       // Restore the partial-block from the closure for the execution of the block
       // i.e. the part inside the block of the partial call.
       options.data = createFrame(options.data);