message: Fix an issue where some boundary dofs are not properly marked
  as essential in ParFiniteElementSpace::GetEssentialVDofs() when
  using a parallel non-conforming mesh.
  This should address GitHub issue
diff: @@ -1010,13 +1010,10 @@ void ParFiniteElementSpace::GetEssentialVDofs(const Array<int> &bdr_attr_is_ess,
  {
  FiniteElementSpace::GetEssentialVDofs(bdr_attr_is_ess, ess_dofs, component);
  - if (Conforming())
  - {
  // Make sure that processors without boundary elements mark
  // their boundary dofs (if they have any).
  Synchronize(ess_dofs);
  }
  -}
  void ParFiniteElementSpace::GetEssentialTrueDofs(const Array<int>
  &bdr_attr_is_ess,
  @@ -1041,7 +1038,8 @@ void ParFiniteElementSpace::GetEssentialTrueDofs(const Array<int>
  {
  if (bool(ted[i]) != bool(true_ess_dofs2[i])) { counter++; }
  }
  - MFEM_VERIFY(counter == 0, "internal MFEM error: counter = " << counter);
  + MFEM_VERIFY(counter == 0, "internal MFEM error: counter = " << counter
  + << ", rank = " << MyRank);
  #endif
  MarkerToList(true_ess_dofs, ess_tdof_list);
  