Use set to add AR_NAME

src/table/io/OutputArchive.cc

@@ -90,15 +90,8 @@ class OutputArchive::Impl {
                               "All catalogs passed to saveCatalog must be created by makeCatalog");
         }
         // Add the name of the class to the header so anyone looking at it can
-        // tell what's stored there.  But we don't want to add it multiple times.
-        try {
-            auto names = iter->getTable()->getMetadata()->getArray<std::string>("AR_NAME");
-            if (std::find(names.begin(), names.end(), name) == names.end()) {
-                iter->getTable()->getMetadata()->add("AR_NAME", name, "Class name for objects stored here");
-            }
-        } catch (pex::exceptions::NotFoundError &) {
-            iter->getTable()->getMetadata()->add("AR_NAME", name, "Class name for objects stored here");
-        }
+        // tell what's stored there.
+        iter->getTable()->getMetadata()->set("AR_NAME", name, "Class name for objects stored here");
         // Also add it as the EXTNAME.
         iter->getTable()->getMetadata()->set("EXTNAME", name);
         indexRecord->set(indexKeys.row0, iter->size());