eapply() fails on baseenv() (PR#8761)

This is because baseenv() is special and has neither HASHTAB nor FRAME.
R_lsInternal shows how to treat it, and I will commit a fix shortly.

eapply() works on most environments, but not on baseenv().  For example,

x <- 1
eapply(globalenv(), function(x) x)
$x
[1] 1

eapply(baseenv(), function(x) x)
list()

I'm probably not going to have time to work on this before 2.3.0, but I
don't think it's really urgent; if no one else fixes it first I'll do it
after the release.

Duncan Murdoch

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Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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Oxford OX1 3TG, UK                Fax:  +44 1865 272595