[RFC/MERGE] _RulesSearcher.get_selected_items should return consistent output

[Marius Kruger]

Hi
I was surprised that _RulesSearcher.get_selected_items
:return: () if no rule matched, otherwise a sequence of name,value
          tuples. The sequence is the same length as names,
          tuple order matches the order in names, and
          undefined preferences are given the value None.

I expected it to always return (('foo', None), ('bar', None))  for
names=('foo','bar'), even if no rules were found for the path
(and not () as per the current behaviour).

I fixed my plugin code to compensate for the current behaviour so I
don't really need this,
but I thought maybe others would also find this strange, so here's a
simple patch.
I thought I'd get some feedback before going so far as writing a test
(you know, maybe I'm way off track with this again :).

-- 
<| regards
U| Marius
H| <><
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