TH2M throws error with embedded fracture permeability model

Description

As reported by @kuateric , TH2m process seems to have trouble with using the embeddedfracture Permeability model which supposedly worked in the past with TH2M, so recent changes seem to have broken something.

Steps to Reproduce the Problem

To reproduce the error, take the benchmark Tests/Data/TH2M/HM/flow_fully_saturated.prj and exchange the permeability property with:

<property>
	<name>permeability</name>
	<type>EmbeddedFracturePermeability</type>
	<intrinsic_permeability>6.6e-21</intrinsic_permeability>
	<initial_aperture>0</initial_aperture>
	<mean_frac_distance>0.01</mean_frac_distance>
	<threshold_strain>1e-4</threshold_strain>
	<fracture_normal>1 0 0</fracture_normal>
	<fracture_rotation_xy>zero</fracture_rotation_xy>
	<fracture_rotation_yz>zero</fracture_rotation_yz>
</property>

and add a zero parameter.

Expected behavior: Simulation executes.

Actual behavior: An error is thrown: error: std::get: wrong index for variant

The error happens in the integration loop of TH2M at models.permeability_model.eval( (L. 217) But I am not capable of debugging this any further. @endJunction maybe you can help?

Specifications

Version: 6.5.4
Platform: Ubuntu 22.04.4 via WSL

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