[PL] LIE: rotations; Init 3rd coordinate for 2d.

ProcessLib/LIE/Common/Utils.cpp

@@ -28,6 +28,7 @@ void computeNormalVector(MeshLib::Element const& e, unsigned const global_dim,
         auto v1 = (*e.getNode(1)) - (*e.getNode(0));
         element_normal[0] = -v1[1];
         element_normal[1] = v1[0];
+        element_normal[2] = 0;  // not used in 2d but needed for normalization
         element_normal.normalize();
     }
     else if (global_dim == 3)