convertsql: get better errors from postgresql on first connection

wcs/ctl/convertsql.py

@@ -58,6 +58,8 @@ class CmdConvertToSql(Command):
                 'port': sub_options.port,
         }
 
+        sql.get_connection_and_cursor(new=True)
+
         print 'converting users'
         from users import User
         sql.do_user_table()