Merge branch 'fix/make-tests-work-without-mpi' into 'master'

[el1p2c] guard struct specialization for parallel case

test failed if mpi was not installed

See merge request !87

dumux/linear/amgparallelhelpers.hh

@@ -1016,6 +1016,7 @@ struct LinearAlgebraPreparator
     }
 };
 
+#if HAVE_MPI
 /*!
  * \brief Specialization for the parallel case.
  */
@@ -1069,7 +1070,7 @@ struct LinearAlgebraPreparator<TypeTag, true>
         }
     }
 };
-
+#endif
 
 } // end namespace Dumux