新增时向grimoirelab推送事件

app/jobs/issue_webhook_job.rb

@@ -46,17 +46,17 @@ class IssueWebhookJob < ApplicationJob
         "body": "#{issue.description}",
         "ref": "",
         "labels": [],
-        "milestone": null,
-        "assignee": null,
-        "assignees": null,
+        "milestone": nil,
+        "assignee": nil,
+        "assignees": nil,
         "state": "open",
         "is_locked": false,
         "comments": 0,
         "created_at": "#{issue.created_on}",
         "updated_at": "#{issue.updated_on}",
-        "closed_at": null,
-        "due_date": null,
-        "pull_request": null,
+        "closed_at": nil,
+        "due_date": nil,
+        "pull_request": nil,
         "repository": {
           "id": 11307,
           "name": "#{project.identifier}",
@@ -95,7 +95,7 @@ class IssueWebhookJob < ApplicationJob
         "private": false,
         "fork": false,
         "template": false,
-        "parent": null,
+        "parent": nil,
         "mirror": false,
         "size": 843,
         "html_url": "#{domain}/#{project.owner.login}/#{project.identifier}",