修复settle price为空导致的错误

application/em/controller/Em.php

@@ -253,6 +253,10 @@ class Em extends Base
 
     public function checkEmComplete($em_id){
         $em = \app\em\model\Em::with('rule')->where('id','=',$em_id)->find();
+
+        if(!$em || !isset($em->rule)){
+            return false;
+        }
         if($em->rule->settle_price == 1 || $em->rule->pay_price == 1){
             return false;
         } else {