add failing test for nested children with 0 children

Gemfile

@@ -0,0 +1,3 @@
+source "http://rubygems.org"
+
+gemspec

Gemfile.lock

@@ -0,0 +1,20 @@
+PATH
+  remote: .
+  specs:
+    jbuilder (0.3)
+      activesupport (>= 3.0.0)
+      blankslate (>= 2.1.2.4)
+
+GEM
+  remote: http://rubygems.org/
+  specs:
+    activesupport (3.1.3)
+      multi_json (~> 1.0)
+    blankslate (2.1.2.4)
+    multi_json (1.0.4)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  jbuilder!

test/jbuilder_test.rb

@@ -111,6 +111,17 @@ def initialize(name, age)
     end
   end
 
+  test "nesting multiple children from array when empty" do
+    comments = []
+
+    json = Jbuilder.encode do |json|
+      json.comments comments, :content
+    end
+
+    JSON.parse(json).tap do |parsed|
+      assert_equal [], parsed["comments"]
+    end
+  end
 
   test "nesting multiple children from array with inline loop" do
     comments = [ Struct.new(:content, :id).new("hello", 1), Struct.new(:content, :id).new("world", 2) ]