Make make_consistent_in_parallel work with no locally owned dofs.

diff --git a/include/deal.II/lac/affine_constraints.templates.h b/include/deal.II/lac/affine_constraints.templates.h
index f0edc5f0daa5aa3c466889abb15da8c12886111b..e0f870bf1024aed28b05bf5ee1b6a20e08cf5864 100644 (file)
--- a/include/deal.II/lac/affine_constraints.templates.h
+++ b/include/deal.II/lac/affine_constraints.templates.h
@@ -708,7 +708,7 @@ AffineConstraints<number>::make_consistent_in_parallel(
 
   Assert(sorted == false, ExcMatrixIsClosed());
 
-  Assert(this->local_lines.is_empty() == false,
+  Assert(this->local_lines.size() > 0,
          ExcMessage(
            "This functionality requires that the AffineConstraints object "
            "knows for which degrees of freedom it can store constraints. "