Merge pull request #8049 from terry-xiaoyu/fix_ci_mqtt_caps

fix(test): emqx_mqtt_caps_SUITE failed with {config_not_found,[zones]}

apps/emqx/test/emqx_mqtt_caps_SUITE.erl

@@ -25,7 +25,7 @@
 all() -> emqx_common_test_helpers:all(?MODULE).
 
 t_check_pub(_) ->
-    OldConf = emqx:get_config([zones]),
+    OldConf = emqx:get_config([zones], #{}),
     emqx_config:put_zone_conf(default, [mqtt, max_qos_allowed], ?QOS_1),
     emqx_config:put_zone_conf(default, [mqtt, retain_available], false),
     timer:sleep(50),
@@ -43,7 +43,7 @@ t_check_pub(_) ->
     emqx_config:put([zones], OldConf).
 
 t_check_sub(_) ->
-    OldConf = emqx:get_config([zones]),
+    OldConf = emqx:get_config([zones], #{}),
     SubOpts = #{
         rh => 0,
         rap => 0,