Carpet: short cut in Restrict(): don't call SyncGVGroup() on empty (vector) groups

darcs-hash:20050325093919-776a0-2cf1c8734de6187a8622ad69f4d6ac3b1f86e14f.gz

1 files changed, 1 insertions, 0 deletions

diff --git a/Carpet/Carpet/src/Restrict.cc b/Carpet/Carpet/src/Restrict.cc
index f8d7397bf..ada404cd0 100644
--- a/Carpet/Carpet/src/Restrict.cc
+++ b/Carpet/Carpet/src/Restrict.cc
@@ -107,6 +107,7 @@ namespace Carpet {
     if (reflevel < reflevels-1) {
       for (int group=0; group<CCTK_NumGroups(); ++group) {
         if (CCTK_GroupTypeI(group) == CCTK_GF
+            && CCTK_NumVarsInGroupI(group) > 0
             && CCTK_QueryGroupStorageI(cgh, group)) {
           SyncGVGroup(cgh, group);
         }