[perl #46669] [TODO] [C] Throw an AttributeError if a PMC is NULL in get_attr_str()

[via RT]

# New Ticket Created by  Paul Cochrane 
# Please include the string:  [perl #46669]
# in the subject line of all future correspondence about this issue. 
# <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=46669 >


In src/pmc/default.pmc:get_attr_str() there is the todo item:

        if (PMC_IS_NULL(p)) {
            /* TODO AttributeError */
        }

This should be as simple as adding a real_exception() here.  Why did I
not just do it?  Well, I'm converting todo items to RT tickets at present.
This is a very low-hanging item, so anyone who wants a quick, easy ticket
go for it!