Simplify ambiguous code

Remove if conditional in favor of boolean failover.

lib/handlebars/compiler/compiler.js

@@ -364,6 +364,7 @@ Compiler.prototype = {
     var options    = this.options;
 
     // if ambiguous, we can possibly resolve the ambiguity now
+    // An eligible helper is one that does not have a complex path, i.e. `this.foo`, `../foo` etc.
     if (isEligible && !isHelper) {
       var name = sexpr.id.parts[0];
 

lib/handlebars/compiler/javascript-compiler.js

@@ -220,7 +220,7 @@ JavaScriptCompiler.prototype = {
   // On stack, after: return value of blockHelperMissing
   //
   // The purpose of this opcode is to take a block of the form
-  // `{{#foo}}...{{/foo}}`, resolve the value of `foo`, and
+  // `{{#this.foo}}...{{/this.foo}}`, resolve the value of `foo`, and
   // replace it on the stack with the result of properly
   // invoking blockHelperMissing.
   blockValue: function() {
@@ -244,8 +244,11 @@ JavaScriptCompiler.prototype = {
   ambiguousBlockValue: function() {
     this.context.aliases.blockHelperMissing = 'helpers.blockHelperMissing';
 
+    // We're being a bit cheeky and reusing the options value from the prior exec
     var params = ["depth0"];
-    this.setupParams(0, params);
+    this.setupParams(0, params, true);
+
+    this.flushInline();
 
     var current = this.topStack();
     params.splice(1, 0, current);
@@ -555,15 +558,12 @@ JavaScriptCompiler.prototype = {
     var helper = this.setupHelper(0, name, helperCall);
 
     var helperName = this.lastHelper = this.nameLookup('helpers', name, 'helper');
-
     var nonHelper = this.nameLookup('depth' + this.lastContext, name, 'context');
-    var nextStack = this.nextStack();
 
-    if (helper.paramsInit) {
-      this.pushSource(helper.paramsInit);
-    }
-    this.pushSource('if (helper = ' + helperName + ') { ' + nextStack + ' = helper.call(' + helper.callParams + '); }');
-    this.pushSource('else { helper = ' + nonHelper + '; ' + nextStack + ' = typeof helper === functionType ? helper.call(' + helper.callParams + ') : helper; }');
+    this.push(
+      '((helper = ' + helperName + ' || ' + nonHelper
+        + (helper.paramsInit ? '),(' + helper.paramsInit : '') + '),'
+      + '(typeof helper === functionType ? helper.call(' + helper.callParams + ') : helper))');
   },
 
   // [invokePartial]