[!355] Find ParMetis seems to be broken after merge in dune-common.

Merge branch 'bugfix/find-parmetis-broken' into 'master'

See merge request [!355]

  [!355]: Nonecore/dune-grid/merge_requests/355

dune/grid/yaspgrid/yaspgridhierarchiciterator.hh

@@ -26,6 +26,9 @@ namespace Dune {
     typedef typename GridImp::YGrid::Iterator I;
     typedef typename GridImp::template Codim<0>::Entity Entity;
 
+    //! default constructor creating empty iterator
+    YaspHierarchicIterator () : _entity(), _maxlevel(-1), stack() {}
+
     //! constructor
     YaspHierarchicIterator (const YGLI& g, const I& it, int maxlevel) :
       _entity(YaspEntity<0, dim, GridImp>(g,it))