Make the GridRefinement::refine function work also when the threshold happens to be zero.
Make the GridRefinement::refine function work also when the threshold happens to be zero.


git-svn-id: 31d9d2f6432a47c86a3640814024c107794ea77c@5271 0785d39b-7218-0410-832d-ea1e28bc413d

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