read.gal() not assigning 0 to nb object

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/spdep@567 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
tidt

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/spdep@568 edb9625f-4e0d-4859-8d74-9fd3b1da38cb