A context global attribute contains a value, but it returns a null

Steps to reproduce :

1. Use any application recipe that you want, with one service in it.
In any lifecycle event handler, place the following groovy code :
println "chef_server_url=" + context.attributes.global["chef_server_url"]

2. Open the CLI

3. cloudify@default>bootstrap-cloud ec2
Successfully created Cloudify Manager on provider...

4. cloudify@default>set-attributes -scope global '{"chef_server_url":"123.456.6337"}'
Attributes updated successfully

5. cloudify@default>list-attributes
{"chef_server_url":"123.456.6337"}

6. cloudify@default>install-application PATH_TO_APPLICATION
Application xxx installed successfully

7. Look for "chef_server_url=" in the log file/s of the service and you'll see :
chef_server_url=null

8. Go back to the CLI and invoke list-attributes again and you'll see that it's not null...
cloudify@default>list-attributes
{"chef_server_url":"123.456.6337"}

I tested it on EC2, but believe it will occur on every other cloud provider as well.