follow through on rsim#1544

Author: akostadinov

lib/active_record/connection_adapters/oracle_enhanced/schema_statements.rb

@@ -699,7 +699,7 @@ def tablespace_for(obj_type, tablespace_option, table_name = nil, column_name =
           end
 
           def default_tablespace_for(type)
-            (default_tablespaces[type] || default_tablespaces[native_database_types[type][:name]]) rescue nil
+            default_tablespaces[type]
           end
 
           def column_for(table_name, column_name)