Mass coefficient if $DENSITY model 2 used

[lurpi]

Hi all,
I think there is a missing condition in the if here:

ogs5/FEM/fem_ele_std.cpp

Line 1581 in 8b235b2

if (FluidProp->compressibility_model_pressure > 0)

If fluid compressibility is taken into account via $DENSITY (without $COMPRESSIBILITY) then the resulting mass coefficient lacks the "divided density" term.
Best,

Luca