修复：脚本中status找不到的情况

lib/tasks/import_issues_from_chandao.rake

@@ -37,7 +37,7 @@ namespace :import_from_chandao do
         "未开始" => 1,
         "进行中" => 2,
         "已完成" => 3,
-        "已关闭" => 4
+        "已关闭" => 5
       }
       h[str]
     end 
@@ -53,7 +53,7 @@ namespace :import_from_chandao do
       if assigner.present? 
         issue.assigners << assigner
       end
-      issue.status_id = trans_status(randd_field_hash['任务状态'])
+      issue.status_id = trans_status(randd_field_hash['任务状态']) || IssueStatus.first.id
       issue.tracker_id = Tracker.first.id
       issue.priority_id = randd_field_hash['优先级'].to_i
       issue.subject = randd_field_hash['任务名称']