bugfix: use operator[] instead of find() if you want to force creation of a...

bugfix: use operator[] instead of find() if you want to force creation of a non-existant entry in a std::map

[[Imported from SVN: r6802]]

dune/gfe/coupling/rodcontinuumsteklovpoincarestep.hh

@@ -422,7 +422,7 @@ continuumDirichletToNeumannMap(const RigidBodyMotion<3>& lambda) const
 {
     std::pair<std::string,std::string> couplingName = std::make_pair("rod", "continuum");
     
-    VectorType& x3d = continuumSubdomainSolutions_.find("continuum")->second;
+    VectorType& x3d = continuumSubdomainSolutions_["continuum"];
     x3d.resize(complex_.continuumGrid("continuum")->size(dim));
     x3d = 0;