IOSS: Cgns - handle missing assemblies correctly

Author: gdsjaar

packages/seacas/libraries/ioss/src/cgns/Iocgns_DatabaseIO.C

@@ -1146,16 +1146,18 @@ namespace Iocgns {
       int idx = 0;
       for (const auto &sb : blocks) {
         unsigned    assem_hash = assem_ids[idx++];
-        std::string name       = assembly_hash_map[assem_hash];
-        auto       *assembly   = get_region()->get_assembly(name);
-        assert(assembly != nullptr);
-        if (!sb->property_exists("assembly")) {
-          assembly->add(sb);
-          Ioss::StructuredBlock *new_sb = const_cast<Ioss::StructuredBlock *>(sb);
-          new_sb->property_add(Ioss::Property("assembly", assembly->name()));
-        }
-        SMART_ASSERT(sb->get_property("assembly").get_string() == assembly->name())
-        (sb->get_property("assembly").get_string())(assembly->name());
+	if (assem_hash > 0) {
+	  std::string name       = assembly_hash_map[assem_hash];
+	  auto       *assembly   = get_region()->get_assembly(name);
+	  assert(assembly != nullptr);
+	  if (!sb->property_exists("assembly")) {
+	    assembly->add(sb);
+	    Ioss::StructuredBlock *new_sb = const_cast<Ioss::StructuredBlock *>(sb);
+	    new_sb->property_add(Ioss::Property("assembly", assembly->name()));
+	  }
+	  SMART_ASSERT(sb->get_property("assembly").get_string() == assembly->name())
+	    (sb->get_property("assembly").get_string())(assembly->name());
+	}
       }
     }
 #endif