message: Fix PABilinearFormExtension::Update()
diff: @@ -152,6 +152,10 @@ void PABilinearFormExtension::Update()
  localX.SetSize(elem_restrict_lex->Height());
  localY.SetSize(elem_restrict_lex->Height());
  }
  +
  + const int iFISz = a->GetFBFI()->Size();
  + if (int_face_restrict_lex && iFISz>0)
  + {
  int_face_restrict_lex = trialFes->GetFaceRestriction(
  ElementDofOrdering::LEXICOGRAPHIC, FaceType::Interior);
  if (int_face_restrict_lex)
  @@ -159,6 +163,11 @@ void PABilinearFormExtension::Update()
  faceIntX.SetSize(int_face_restrict_lex->Height());
  faceIntY.SetSize(int_face_restrict_lex->Height());
  }
  + }
  +
  + const int bFISz = a->GetBFBFI()->Size();
  + if (bound_face_restrict_lex && bFISz>0)
  + {
  bound_face_restrict_lex = trialFes->GetFaceRestriction(
  ElementDofOrdering::LEXICOGRAPHIC, FaceType::Boundary);
  if (bound_face_restrict_lex)
  @@ -167,6 +176,7 @@ void PABilinearFormExtension::Update()
  faceBoundY.SetSize(bound_face_restrict_lex->Height());
  }
  }
  +}
  void PABilinearFormExtension::FormSystemMatrix(const Array<int> &ess_tdof_list,
  OperatorHandle &A)
  