zero-extent matrices (PR#958)

In 1.2.3
  matrix(nrow=10,ncol=0)%*%numeric(0)
returns a 10x1 matrix of 0s

In todays 1.3 it returns a 10x1 matrix of miscellaneous junk.

While both are probably wrong the latter is causing problems for survival.

	-thomas

platform i686-pc-linux-gnu
arch     i686
os       linux-gnu
system   i686, linux-gnu
status   Under development (unstable)
major    1
minor    3.0
year     2001
month    05
day      30
language R



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