Fixed command does not support swow.

Author: limingxinleo

src/Command.php

@@ -436,9 +436,11 @@ protected function execute(InputInterface $input, OutputInterface $output)
                 $this->eventDispatcher && $this->eventDispatcher->dispatch(new Event\BeforeHandle($this));
                 call([$this, 'handle']);
                 $this->eventDispatcher && $this->eventDispatcher->dispatch(new Event\AfterHandle($this));
-            } catch (ExitException $exception) {
-                // Do nothing.
             } catch (\Throwable $exception) {
+                if (class_exists(ExitException::class) && $exception instanceof ExitException) {
+                    return 0;
+                }
+
                 if (! $this->eventDispatcher) {
                     throw $exception;
                 }

src/Listener/ClearTimerListener.php

@@ -26,6 +26,6 @@ public function listen(): array
 
     public function process(object $event)
     {
-        Timer::clearAll();
+        class_exists(Timer::class) && Timer::clearAll();
     }
 }