add an assert in p::d::Tria::load() that the file exists

diff --git a/source/distributed/tria.cc b/source/distributed/tria.cc
index a28a55eb3e5d5091febadcb7f3240129bfa2e9c1..f2a9ed6282c178c4c3c86af1cf55da17751c3a4d 100644 (file)
--- a/source/distributed/tria.cc
+++ b/source/distributed/tria.cc
@@ -1830,6 +1830,8 @@ namespace parallel
       {
         std::string fname=std::string(filename)+".info";
         std::ifstream f(fname.c_str());
+        Assert (f, ExcMessage("Could not open the file <" +
+                              fname + ">."));
         std::string firstline;
         getline(f, firstline); //skip first line
         f >> version >> numcpus >> attached_size >> attached_count >> n_coarse_cells;