Use terinary operator for inline appends

Allows for append operations to avoid breaking inline chain.

lib/handlebars/compiler/javascript-compiler.js

@@ -289,13 +289,18 @@ JavaScriptCompiler.prototype = {
   // If `value` is truthy, or 0, it is coerced into a string and appended
   // Otherwise, the empty string is appended
   append: function() {
-    // Force anything that is inlined onto the stack so we don't have duplication
-    // when we examine local
-    this.flushInline();
-    var local = this.popStack();
-    this.pushSource('if (' + local + ' != null) { ' + this.appendToBuffer(local) + ' }');
-    if (this.environment.isSimple) {
-      this.pushSource("else { " + this.appendToBuffer("''") + " }");
+    if (this.isInline()) {
+      this.replaceStack(function(current) {
+        return ' != null ? ' + current + ' : ""';
+      });
+
+      this.pushSource(this.appendToBuffer(this.popStack()));
+    } else {
+      var local = this.popStack();
+      this.pushSource('if (' + local + ' != null) { ' + this.appendToBuffer(local) + ' }');
+      if (this.environment.isSimple) {
+        this.pushSource("else { " + this.appendToBuffer("''") + " }");
+      }
     }
   },