remove value check, if attribute value was 0, then check was failing

git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/trunk@2883 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd

perl-xCAT/xCAT/Utils.pm

@@ -543,7 +543,7 @@ sub get_site_attribute
     if ($sitetab)
     {
         (my $ref) = $sitetab->getAttribs({key => $attr}, 'value');
-        if ($ref and $ref->{value})
+        if ($ref)
         {
             $values = $ref->{value};
         }