R-beta: logical indexing on a list

[Robert Gentleman]

Doug Bates reports the problem:

  tt <- list(foo = 1, bar = 2)
  
  > tt[c(F,F)]
Error: attempt to set an attribute on NULL

The problem is that in R there is only one NULL and if attributes are
set on it they appear in all instances of NULL which is a bit undesireable.
This problem will go away once we get generic vectors going. In the meantime,
changing line 184 of src/main/subset.c to only carry out the attribute
assignment when result != R_NilValue  will take care of it. This will be
distributed with the next set of patches.
   robert
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