Add update() method for grid to adapt dependencies

amdis/AdaptiveGrid.hpp

@@ -202,6 +202,12 @@ namespace AMDiS
       info(2,"AdaptiveGrid::postAdapt needed {} seconds", t.elapsed());
     }
 
+    /// Update all registered dependent objects if grid is changed manually
+    void update()
+    {
+      this->notify(event::adapt{true});
+    }
+
     /// Returns the grid change index, see \ref changeIndex.
     unsigned long changeIndex() const
     {

amdis/DataTransfer.inc.hpp

@@ -150,8 +150,10 @@ void DataTransfer<C,B>::adapt(C& coeff)
 {
   coeff.resize();
 
-  test_exit(!persistentContainer_.empty(), "No data was saved before adapting the grid, make "
-    "sure to call DataTransfer::preAdapt before calling adapt() on the grid");
+  // No data was saved before adapting the grid, make
+  // sure to call DataTransfer::preAdapt before calling adapt() on the grid
+  if (persistentContainer_.empty())
+    return;
 
   GridView gv = basis_->gridView();
   LocalView lv = basis_->localView();