【修改】模块中未注册插件在运行过程可能存在错误

src/lua_plugin_cfunc.c

@@ -52,7 +52,8 @@ void *lpm_ctx_new_func(
     struct lua_plugin *plugin = NULL;
     while ((plugin = utarray_next(env->plugin_array, plugin)))
     {
-        if (plugin->plugin_id == plugin_id)
+        /* BugFix: 如果在该model中未注册插件, 可能导致的错误 */
+        if (plugin && plugin->plugin_id == plugin_id)
             break;
     }
     // LOGDEBUG("%d call plugin id %d, ref %d\n", plugin_id, plugin->plugin_id, plugin->ctx_new_ref);