Thold 1.8.1没有找到可以设置邮件列表的地方

[chengjiangghr]

Describe the bug
我将cacti部署到最新版本1.2.27，各种插件也安装是最新版本，但是在设备管理中，邮件通知全局列表，没有找到该列表在哪里可以创建，如下：

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
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Plugin (please complete the following information):

• Version: [e.g. 1.2]
• Source: [e.g. cacti.net, package, github]
• Identifier: [e.g. apt/yum package name or github commit ref]

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
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