[DEM-Fluid] Example not running

[jginternational]

In order to implement #645 I was trying to run the example of the Swimming Dem application but I couldn't run it.
examplefluiddem.gid.zip

  File "E:\PROYECTOS\KratosGiD\kratos.gid\exec\kratos\applications\DEMApplication\python_scripts\sphere_strategy.py", line 623, in ModifyProperties
    DiscontinuumConstitutiveLaw = globals().get(properties[DEM_DISCONTINUUM_CONSTITUTIVE_LAW_NAME])()
TypeError: 'NoneType' object is not callable

[farrufat-cimne]

I think the error is related to this:

Begin Properties 1
DEM_DISCONTINUUM_CONSTITUTIVE_LAW_NAME Newtonian3DLaw
DEM_CONTINUUM_CONSTITUTIVE_LAW_NAME DEMContinuumConstitutiveLaw
End Properties

Begin Properties 2
DEM_DISCONTINUUM_CONSTITUTIVE_LAW_NAME DEM_D_Hertz_viscous_Coulomb
PARTICLE_DENSITY 2500.0
YOUNG_MODULUS 1000000.0
POISSON_RATIO 0.20
FRICTION 1.0
COEFFICIENT_OF_RESTITUTION 0.2
PARTICLE_MATERIAL 2
ROLLING_FRICTION 0.01
ROLLING_FRICTION_WITH_WALLS 0.01
PARTICLE_SPHERICITY 1.0
DEM_CONTINUUM_CONSTITUTIVE_LAW_NAME DEMContinuumConstitutiveLaw
End Properties

but properties 1 (with default law name?) is actually not being used or assigned to anything

i will give it a look. maybe something broke with recent updates or the example is not correctly constructed/assigned.

[jginternational]

I think I've got it.

Check this commit:
a4f6b6c