fixed: eclalugridvanguard did not build in serial

while the comm object is implicitly castable to a mpi_comm
with mpi, it is not implicitly castable to a no_comm
without.

ebos/eclalugridvanguard.hh

@@ -32,6 +32,8 @@
 #include "alucartesianindexmapper.hh"
 #include <opm/models/common/multiphasebaseproperties.hh>
 
+#include <opm/common/OpmLog/OpmLog.hpp>
+
 #include <dune/alugrid/grid.hh>
 #include <dune/alugrid/common/fromtogridfactory.hh>
 #include <dune/alugrid/dgf.hh>
@@ -292,7 +294,11 @@ protected:
             OpmLog::info("\nProcessing grid");
         }
 
+#if HAVE_MPI
         this->equilGrid_ = std::make_unique<Dune::CpGrid>(EclGenericVanguard::comm());
+#else
+        this->equilGrid_ = std::make_unique<Dune::CpGrid>();
+#endif
         // Note: removed_cells is guaranteed to be empty on ranks other than 0.
         auto removed_cells =
             this->equilGrid_->processEclipseFormat(input_grid,