fix(rule apply test): do not crash when the rule is not found

apps/emqx_rule_engine/src/emqx_rule_engine_api.erl

@@ -274,6 +274,7 @@ schema("/rules/:id/test") ->
             responses => #{
                 400 => error_schema('BAD_REQUEST', "Invalid Parameters"),
                 412 => error_schema('NOT_MATCH', "SQL Not Match"),
+                404 => error_schema('RULE_NOT_FOUND', "The rule could not be found"),
                 200 => <<"Rule Applied">>
             }
         }
@@ -424,6 +425,8 @@ param_path_id() ->
                     {400, #{code => 'BAD_REQUEST', message => err_msg(Reason)}};
                 {error, nomatch} ->
                     {412, #{code => 'NOT_MATCH', message => <<"SQL Not Match">>}};
+                {error, rule_not_found} ->
+                    {404, #{code => 'RULE_NOT_FOUND', message => <<"The rule could not be found">>}};
                 {error, Reason} ->
                     {400, #{code => 'BAD_REQUEST', message => err_msg(Reason)}}
             end

apps/emqx_rule_engine/src/emqx_rule_sqltester.erl

@@ -26,12 +26,22 @@
 
 apply_rule(
     RuleId,
+    Parameters
+) ->
+    case emqx_rule_engine:get_rule(RuleId) of
+        {ok, Rule} ->
+            do_apply_rule(Rule, Parameters);
+        not_found ->
+            {error, rule_not_found}
+    end.
+
+do_apply_rule(
+    Rule,
     #{
         context := Context,
         stop_action_after_template_rendering := StopAfterRender
     }
 ) ->
-    {ok, Rule} = emqx_rule_engine:get_rule(RuleId),
     InTopic = get_in_topic(Context),
     EventTopics = maps:get(from, Rule, []),
     case lists:all(fun is_publish_topic/1, EventTopics) of