[tutorial] Fix assert and warning when using debug opts

exercises/exercise-mainfile/1pproblem.hh

@@ -114,11 +114,19 @@ class OnePTestProblem : public PorousMediumFlowProblem<TypeTag>
     using BoundaryTypes = typename GET_PROP_TYPE(TypeTag, BoundaryTypes);
     static constexpr int dimWorld = GridView::dimensionworld;
     using GlobalPosition = typename Element::Geometry::GlobalCoordinate;
+    using FluidSystem = typename GET_PROP_TYPE(TypeTag, FluidSystem);
 
 public:
     OnePTestProblem(std::shared_ptr<const FVGridGeometry> fvGridGeometry)
     : ParentType(fvGridGeometry)
-    {}
+    {
+        FluidSystem::Component::init(/*tempMin=*/272.15,
+                                     /*tempMax=*/294.15,
+                                     /*numTemp=*/10,
+                                     /*pMin=*/1.0e4,
+                                     /*pMax=*/1.0e6,
+                                     /*numP=*/200);
+    }
 
     /*!
      * \brief Specifies which kind of boundary condition should be

exercises/exercise-mainfile/exercise_1p_c.cc

@@ -99,7 +99,7 @@ int main(int argc, char** argv) try
     // the grid variables
     using GridVariables = typename GET_PROP_TYPE(TypeTag, GridVariables);
     auto gridVariables = std::make_shared<GridVariables>(problem, fvGridGeometry);
-    gridVariables->init(x);
+    gridVariables->init(x, xOld);
 
     // intialize the vtk output module
     using VtkOutputFields = typename GET_PROP_TYPE(TypeTag, VtkOutputFields);