when instancing FMatrix<0> then Array of length 1 is created.

[[Imported from SVN: r4225]]

common/fmatrix.hh

@@ -943,7 +943,7 @@ namespace Dune {
 
   private:
     // the data, very simply a built in array with rowwise ordering
-    row_type p[n];
+    row_type p[(n > 0) ? n : 1];
   };