Fix context-stack when calling block-helpers on null values

Fixes #1319

Original behaviour:
- When a block-helper was called on a null-context, an empty object was used
  as context instead. (#1093)
- The runtime verifies that whether the current context equals the
  last context and adds the current context to the stack, if it is not.
  This is done, so that inside a block-helper, the ".." path can be used
  to go back to the parent element.
- If the helper is called on a "null" element, the context was added, even
  though it shouldn't be, because the "null != {}"

Fix:
- The commit replaces "null" by the identifiable "container.nullContext"
  instead of "{}". "nullContext" is a sealed empty object.
- An additional check in the runtime verifies that the context is
  only added to the stack, if it is not the nullContext.

lib/handlebars/compiler/javascript-compiler.js

@@ -910,7 +910,7 @@ JavaScriptCompiler.prototype = {
     let params = [],
         paramsInit = this.setupHelperArgs(name, paramSize, params, blockHelper);
     let foundHelper = this.nameLookup('helpers', name, 'helper'),
-        callContext = this.aliasable(`${this.contextName(0)} != null ? ${this.contextName(0)} : {}`);
+        callContext = this.aliasable(`${this.contextName(0)} != null ? ${this.contextName(0)} : container.nullContext`);
 
     return {
       params: params,

lib/handlebars/runtime.js

@@ -121,6 +121,8 @@ export function template(templateSpec, env) {
 
       return obj;
     },
+    // An empty object to use as replacement for null-contexts
+    nullContext: Object.seal({}),
 
     noop: env.VM.noop,
     compilerInfo: templateSpec.compiler
@@ -174,7 +176,7 @@ export function template(templateSpec, env) {
 export function wrapProgram(container, i, fn, data, declaredBlockParams, blockParams, depths) {
   function prog(context, options = {}) {
     let currentDepths = depths;
-    if (depths && context != depths[0]) {
+    if (depths && context != depths[0] && !(context === container.nullContext && depths[0] === null)) {
       currentDepths = [context].concat(depths);
     }
 

spec/regressions.js

@@ -288,4 +288,9 @@ describe('Regressions', function() {
 
     shouldCompileTo('{{helpa length="foo"}}', [obj, helpers], 'foo');
   });
+
+  it('GH-1319: "unless" breaks when "each" value equals "null"', function() {
+    var string = '{{#each list}}{{#unless ./prop}}parent={{../value}} {{/unless}}{{/each}}';
+    shouldCompileTo(string, { value: 'parent', list: [ null, 'a'] }, 'parent=parent parent=parent ', '');
+  });
 });