Merge branch 'fix/clang-error' into 'master'

[3pimmiscible] Remove DUNE_THROW from constexpr function

Closes #774

See merge request !1731

dumux/material/fluidsystems/3pimmiscible.hh

@@ -121,7 +121,7 @@ public:
             case wPhaseIdx: return WettingFluid::isGas(); break;
             case nPhaseIdx: return NonwettingFluid::isGas(); break;
             case gPhaseIdx: return Gas::isGas(); break;
-            default: DUNE_THROW(Dune::InvalidStateException, "Invalid phase index");
+            default: return false; // TODO: constexpr-compatible throw
         }
     }
 
@@ -160,7 +160,7 @@ public:
             case wPhaseIdx: return WettingFluid::isCompressible(); break;
             case nPhaseIdx: return NonwettingFluid::isCompressible(); break;
             case gPhaseIdx: return Gas::isCompressible(); break;
-            default: DUNE_THROW(Dune::InvalidStateException, "Invalid phase index");
+            default: return false; // TODO: constexpr-compatible throw
         }
     }
 
@@ -180,7 +180,7 @@ public:
             case wPhaseIdx: return WettingFluid::isIdealGas(); break;
             case nPhaseIdx: return NonwettingFluid::isIdealGas(); break;
             case gPhaseIdx: return Gas::isIdealGas(); break;
-            default: DUNE_THROW(Dune::InvalidStateException, "Invalid phase index");
+            default: return false; // TODO: constexpr-compatible throw
         }
     }