[fluidsystems] Assert phase statein 1pgas/liquid fluidsystem

dumux/material/fluidsystems/1pgas.hh

@@ -30,6 +30,7 @@
 #include <dune/common/exceptions.hh>
 
 #include <dumux/material/fluidsystems/base.hh>
+#include <dumux/material/components/componenttraits.hh>
 
 namespace Dumux
 {
@@ -48,6 +49,8 @@ class OnePGas
     using ThisType = OnePGas<Scalar, ComponentT>;
     using Base = BaseFluidSystem<Scalar, ThisType>;
 
+    static_assert(ComponentTraits<ComponentT>::hasGasState, "The component does not implement a gas state!");
+
 public:
     using Component = ComponentT;
     using ParameterCache = NullParameterCache;

dumux/material/fluidsystems/1pliquid.hh

@@ -30,6 +30,7 @@
 #include <dune/common/exceptions.hh>
 
 #include <dumux/material/fluidsystems/base.hh>
+#include <dumux/material/components/componenttraits.hh>
 
 namespace Dumux
 {
@@ -47,6 +48,8 @@ class OnePLiquid
     using ThisType = OnePLiquid<Scalar, ComponentT>;
     using Base = BaseFluidSystem<Scalar, ThisType>;
 
+    static_assert(ComponentTraits<ComponentT>::hasLiquidState, "The component does not implement a liquid state!");
+
 public:
     using Component = ComponentT;
     using ParameterCache = NullParameterCache;