Page Properties Macro does not work if used with a label and variable in a template/blueprint

Summary of Bug

If the Page Properties macro is used in a template, along with a variable as the value of the page property, the macro will face an error when trying to create from template, and the macro will be erased when the page is created.

Steps to replicate

1. Create a template that uses the Page Properties macro, with a label property set and with a variable as a value :
   
2. Try to create a page using that template. There will be an error in the Page Template Wizard :
   
3. If the user clicks on 'Next', the resulting page creation section will no longer have the Page Properties Macro

Additional Info

• Tested in Confluence 5.1.2
• Tested in Firefox 21