The following manifest was failing:
$data = {}

This patch makes sure we initalize our ast hash with an empty ruby
hash when it is created without any values.

Signed-off-by: Brice Figureau <[email protected]>
---
 lib/puppet/parser/ast/asthash.rb |    5 +++++
 spec/unit/parser/ast/asthash.rb  |   12 ++++++++++++
 2 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/lib/puppet/parser/ast/asthash.rb b/lib/puppet/parser/ast/asthash.rb
index aa5127d..d049019 100644
--- a/lib/puppet/parser/ast/asthash.rb
+++ b/lib/puppet/parser/ast/asthash.rb
@@ -28,5 +28,10 @@ class Puppet::Parser::AST
         def to_s
             "{" + @value.collect { |v| v.collect { |a| a.to_s }.join(' => ') 
}.join(', ') + "}"
         end
+
+        def initialize(args)
+            super(args)
+            @value ||= {}
+        end
     end
 end
diff --git a/spec/unit/parser/ast/asthash.rb b/spec/unit/parser/ast/asthash.rb
index c6839ab..fc8e1c7 100644
--- a/spec/unit/parser/ast/asthash.rb
+++ b/spec/unit/parser/ast/asthash.rb
@@ -78,6 +78,18 @@ describe Puppet::Parser::AST::ASTHash do
         operator.evaluate(@scope).should == { key1 => "b", key2 => "d" }
     end
 
+    describe "when being initialized without arguments" do
+        it "should evaluate to an empty hash" do
+            hash = Puppet::Parser::AST::ASTHash.new({})
+            hash.evaluate(@scope).should == {}
+        end
+
+        it "should support merging" do
+            hash = Puppet::Parser::AST::ASTHash.new({})
+            hash.merge({"a" => "b"}).should == {"a" => "b"}
+        end
+    end
+
     it "should return a valid string with to_s" do
         hash = Puppet::Parser::AST::ASTHash.new(:value => { "a" => "b", "c" => 
"d" })
 
-- 
1.6.6.1

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