log invalid response

bubble-server/src/main/resources/bubble/rule/bblock/BubbleBlockRuleDriver_stats.js.hbs

@@ -19,7 +19,7 @@ const {{JS_PREFIX}}_app_refresh_interval = window.setInterval(function () {
             try {
                 return resp.json();
             } catch (error) {
-                console.log('cancelling window.interval, response not json');
+                console.log('cancelling window.interval, response not json: '+JSON.stringify(resp));
                 window.clearInterval({{JS_PREFIX}}_app_refresh_interval);
             }
         })