[PATCH 5/7] [python] API for macros: gdb.Objfile symtabs method.

[Paul_Koning@Dell.com]

>> If there are no symtabs, why return an empty list?  Would Py_None make 
>> more sense here.  And same rules apply to returning a Tuple, too, as 
>> others.
>
>the main reason here to return an empty list is just because things like
>
>(gdb) py for i in None: print "foo"
>Traceback (most recent call last):
>  File "<string>", line 1, in <module>
>TypeError: 'NoneType' object is not iterable Error while executing Python code.

There's a precedent: gdb.Type.fields() returns an empty list if the type doesn't have fields.  I was wondering why that is, but your explanation gives the reason.

	paul