Fix linter

src/lbmpy/boundaries/boundaryconditions.py

@@ -1050,7 +1050,6 @@ class ExtrapolationOutflow(LbBoundary):
             weight = weight_of_direction(dir_symbol, lb_method)
             c_t = self.density_correction_factor * weight * (self.density - index_field[0]('rho'))
 
-
         interpolated_pdf_sym = sp.Symbol('pdf_inter')
         interpolated_pdf_asm = Assignment(interpolated_pdf_sym, (index_field[0]('pdf') * c_s)
                                           + ((sp.Number(1) - c_s) * index_field[0]('pdf_nd')) + c_t)