添加500异常显示

jpress-web-core/src/main/java/io/jpress/core/cache/ActionCacheHandler.java

@@ -79,6 +79,7 @@ public class ActionCacheHandler extends Handler {
 				writer.write(renderContent);
 				isHandled[0] = true;
 			} catch (Exception e) {
+				log.error("no catch exception", e);
 				RenderFactory.me().getErrorRender(500).setContext(request, response, action.getViewPath()).render();
 			} finally {
 				if (writer != null) {